fjh Posted December 4, 2022 Share Posted December 4, 2022 1 hour ago, Mark T said: and in case you're kick'n it old school avoid some guess work ----------------------------------------------------------------------------------------------------------------------- Funny you posted this ! I recently had to fab up a similar test tool to check a perkins for head gasket issue wouldn't start blowing black smoke bla bla! The story is to long to explain! Anyway its a valuable tool if you have time to make it ! Or time to wait to buy one! In this case Dave did what he had to do to nail down the issue! and undeniably proved out the valve not sealing by removing the intake and running it! The Jake is a vague possibility But until the engine is up and running again we won't know! Next week will tell the tale in my mind!😅 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517264 Share on other sites More sharing options...
Mark T Posted December 4, 2022 Share Posted December 4, 2022 My old SnapOn guy got me that . It was around 20 years ago. It is handy . That and the camera. The resolution on that is really good and it can interface with something with a bigger screen Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517271 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 I like my snap-on camera as well. its 3 feet long. it will take snapshots also.. Pricy, but valuable... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517276 Share on other sites More sharing options...
Mark T Posted December 4, 2022 Share Posted December 4, 2022 6 minutes ago, Joey Mack said: I like my snap-on camera as well. its 3 feet long. it will take snapshots also.. Pricy, but valuable... jojo Saves a lot of headaches sometimes. Some stuff you need to kinda know what to look for but I'd buy another one in a second after having one. Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517279 Share on other sites More sharing options...
Mark T Posted December 4, 2022 Share Posted December 4, 2022 Just now, Mark T said: Saves a lot of headaches sometimes. Some stuff you need to kinda know what to look for but I'd buy another one in a second after having one. It'll even work under clothes....like a blouse or something Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517281 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 Yes sir.. I need to get another compression tester. I dont do engine diag. anymore, ( accept for here at BMT). or at least I try.. But i'm sure one will come along one day.. i like that you have the hold down bar for E-6 injectors.. Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517282 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 How about providing a "Mobile Colonoscopy Service"? 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517283 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 I pulled a "Mechohalic" I went off topic... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517286 Share on other sites More sharing options...
fjh Posted December 4, 2022 Share Posted December 4, 2022 43 minutes ago, Joey Mack said: I pulled a "Mechohalic" I went off topic... Yup all good ! 😁 I didn't manage to snag a camera before I retired 😔 Oh well them diagnostic days are over right? we got computers now they solve everything! 🙄 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517288 Share on other sites More sharing options...
Joey Mack Posted December 4, 2022 Share Posted December 4, 2022 Yeah, Computers,,, That's the ticket.. No need to; look/listen/hear/feel/or smell??? anymore, just change the part listed on the screen... Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517294 Share on other sites More sharing options...
fjh Posted December 4, 2022 Share Posted December 4, 2022 8 minutes ago, Joey Mack said: Yeah, Computers,,, That's the ticket.. No need to; look/listen/hear/feel/or smell??? anymore, just change the part listed on the screen... Yup sorry ! sold that yesterday ! I am not missing hearing that excuse ! Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517301 Share on other sites More sharing options...
Popular Post Joey Mack Posted December 4, 2022 Popular Post Share Posted December 4, 2022 I prefer to do the diag. myself.. PTT is useful, but I have to use MY Brain and 6 senses.. just sayin' 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517302 Share on other sites More sharing options...
mdixon Posted December 4, 2022 Share Posted December 4, 2022 2 hours ago, Joey Mack said: Yeah, Computers,,, That's the ticket.. No need to; look/listen/hear/feel/or smell??? anymore, just change the part listed on the screen... Still need to isolate, replicate and verify. Just firing the parts cannon is an awful way to wrench. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517332 Share on other sites More sharing options...
Popular Post mechohaulic Posted December 4, 2022 Popular Post Share Posted December 4, 2022 3 hours ago, Joey Mack said: Yeah, Computers,,, That's the ticket.. No need to; look/listen/hear/feel/or smell??? anymore, just change the part listed on the screen... but I like to : look at it, feel it; NOT always the smell part 😝, oh wife; jojo says need a computer !! LOL 3 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517333 Share on other sites More sharing options...
ChallengeDave Posted December 6, 2022 Author Share Posted December 6, 2022 Alright guys, minor update that everyone has been waiting for. Machine shop got back to me yesterday and told me the intake valves were hammered. So they disassembled the rest and found that the guides and on the intake and exhaust valves on all three has considerable wear. I did not know this, but they only replaced the exhaust valves , not the intakes. According to them, they didn't need to be replaced, so i guess they just resurfaced the intake side. I do trust these guys for the most part. Been dealing with them for years and have never once have a problem. They are doing some more research and investigating on their end as far as the parts that are in these heads(remember, they were 350 cores). They were worried that maybe this engine was turned up quite a bit can caused the very fast wear. All i had done to it was spec it out to 427(vmac). I may be missing some more details on what they told me(I have the memory of a goldfish). Now I am working on pulling off the second head, because more then likely, its in a rough state as well. Been super busy between this, rebuilding a Liebherr engine, Cat axle rebuild, and running the shop. So its been a slow process figuring this one out. Ill feed you guys some more once I can. Thanks again everyone! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517538 Share on other sites More sharing options...
fjh Posted December 6, 2022 Share Posted December 6, 2022 35 minutes ago, ChallengeDave said: Alright guys, minor update that everyone has been waiting for. Machine shop got back to me yesterday and told me the intake valves were hammered. So they disassembled the rest and found that the guides and on the intake and exhaust valves on all three has considerable wear. I did not know this, but they only replaced the exhaust valves , not the intakes. According to them, they didn't need to be replaced, so i guess they just resurfaced the intake side. I do trust these guys for the most part. Been dealing with them for years and have never once have a problem. They are doing some more research and investigating on their end as far as the parts that are in these heads(remember, they were 350 cores). They were worried that maybe this engine was turned up quite a bit can caused the very fast wear. All i had done to it was spec it out to 427(vmac). I may be missing some more details on what they told me(I have the memory of a goldfish). Now I am working on pulling off the second head, because more then likely, its in a rough state as well. Been super busy between this, rebuilding a Liebherr engine, Cat axle rebuild, and running the shop. So its been a slow process figuring this one out. Ill feed you guys some more once I can. Thanks again everyone! rebuilding a Liebherr engine lucky you! Thanx for posting! I m glad they fessed up or partly! The chances of the engine being cranked up are remote in my mind( Buck Pass) !how ever if you paid for rebuilt heads the first time that's what you should get! just sayin! this puts all of our speculation to bed ! Nice find! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517539 Share on other sites More sharing options...
fjh Posted December 6, 2022 Share Posted December 6, 2022 Just a honorable mention! When you get the heads back Make sure you set the yokes correctly . In my opinion ,There is know reason why valve guides should wear quickly on a four valve engine at any horse power unless the yokes are ill set! There is very little side thrust on these! And if your Machine shop provides you with some parts miss match of valve guides and valves between the 350 and 427 I for one and likely others here (Joey 😅) would like to know about it! Thanx just sayin! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517547 Share on other sites More sharing options...
Joey Mack Posted December 6, 2022 Share Posted December 6, 2022 Very true, FJH.. yoke setting is crucial, and I have seen it overlooked many times.. I have also replace guide pins for that reason.. With the Jake heads on, patience is very important during valve adjustment.. with rockers off,,,. It's a breeze.. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517552 Share on other sites More sharing options...
ChallengeDave Posted December 6, 2022 Author Share Posted December 6, 2022 So after further conversations with the machine shop, they came to the conclusion that this thing has been running hot. By that they mean the combustion temperature is too hot. I didn't get a report from my driver as far as high egt or boost issues. Ill double check timing to make sure thats not affecting anything. Seems a bit odd to me, dont know if i buy it. maybe one thing could be that this has the smaller charge air cooler on it. This is a 95 Ch that came with a 350. I dont know if the 427 came with a larger cooler. What do you guys think? Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517570 Share on other sites More sharing options...
Mark T Posted December 6, 2022 Share Posted December 6, 2022 30 minutes ago, ChallengeDave said: So after further conversations with the machine shop, they came to the conclusion that this thing has been running hot. By that they mean the combustion temperature is too hot. I didn't get a report from my driver as far as high egt or boost issues. Ill double check timing to make sure thats not affecting anything. Seems a bit odd to me, dont know if i buy it. maybe one thing could be that this has the smaller charge air cooler on it. This is a 95 Ch that came with a 350. I dont know if the 427 came with a larger cooler. What do you guys think? I think if your heads are acceptable cores ???? get two new heads and 6 new bolts for the Jakes Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517572 Share on other sites More sharing options...
fjh Posted December 6, 2022 Share Posted December 6, 2022 1 hour ago, ChallengeDave said: So after further conversations with the machine shop, they came to the conclusion that this thing has been running hot. By that they mean the combustion temperature is too hot. I didn't get a report from my driver as far as high egt or boost issues. Ill double check timing to make sure thats not affecting anything. Seems a bit odd to me, dont know if i buy it. maybe one thing could be that this has the smaller charge air cooler on it. This is a 95 Ch that came with a 350. I dont know if the 427 came with a larger cooler. What do you guys think? I don't remember if there is an off set key for that motor It may be possible may be Mack pro Or joey has this answer! Yup check the initial timing for sure! Does the truck have a boost gauge and a pyro gauge ! Hesitate to give an answer with out evidence! At this point like I said before they don't want to look like the bad guys here! I think the buck pass is going on! I know you have to change the cam key for some horse power changes ! (Mack pro) The gauges won't lie!! Once you get it fired again and run it if the pyro is over 1000-1200 on a pull and the boost is low say 25 then you could have boost leaks or if the wrong key is installed it may cause an issue as well! Also I can see issues with heat on the exhaust not the intake! Just my thought! need to get her fixed just get on with it and fight if need be later! Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517575 Share on other sites More sharing options...
Mark T Posted December 6, 2022 Share Posted December 6, 2022 There's some difference with the cam. I know the Jake setting is different and if the truck has no muffler the engine brakes sound different . but what is it 🤔 Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517576 Share on other sites More sharing options...
fjh Posted December 6, 2022 Share Posted December 6, 2022 8 minutes ago, Mark T said: There's some difference with the cam. I know the Jake setting is different and if the truck has no muffler the engine brakes sound different . but what is it 🤔 Ya they bumped the jake set to 21 at one point not sure why? they started out at 15 in the begining! that tells me the valve opens 6 thou less different sound! maybe! Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517578 Share on other sites More sharing options...
Mark T Posted December 6, 2022 Share Posted December 6, 2022 (edited) I know without a muffler, the 350s sounded a lot cooler (lol for whatever that's worth) the 427s didn't sound like that. Something is different with the cam . So maybe there was something overlooked during the HP increase ??? There really ids no way to measure the heat in there where the action is....and even with a pyro it's measuring the heat after the energy of it is spent on the turbo. Those heads are probably both on barrowed time at best if it happened after running it a while. Edited December 6, 2022 by Mark T more information Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517580 Share on other sites More sharing options...
Joey Mack Posted December 6, 2022 Share Posted December 6, 2022 ;F;.. I think you are thinking about the E-Tech?? I believe he has an E-7........... Quote Link to comment https://www.bigmacktrucks.com/topic/70801-cylinder-pressure-out-intake-port/page/5/#findComment-517588 Share on other sites More sharing options...
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