Blue Ox Posted January 13, 2019 Share Posted January 13, 2019 I have a 2000 ch613 with e7 460. The jake was dropping out so pulled the valve covers to check it out. I found the exhaust valves had 1/4 inch lash. Adjusted them to .025 and tried to start it. The engine wouldn't fire. Backed the adjustment for the valves back closer to what they were before and it starts but sounds like the jake is on. I have had the truck for about 3 years and had not touched the engine before and don't have any past history on it. Any ideas on what the problem is? Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/ Share on other sites More sharing options...
terry Posted January 13, 2019 Share Posted January 13, 2019 58 minutes ago, Blue Ox said: I have a 2000 ch613 with e7 460. The jake was dropping out so pulled the valve covers to check it out. I found the exhaust valves had 1/4 inch lash. Adjusted them to .025 and tried to start it. The engine wouldn't fire. Backed the adjustment for the valves back closer to what they were before and it starts but sounds like the jake is on. I have had the truck for about 3 years and had not touched the engine before and don't have any past history on it. Any ideas on what the problem is? you better get a engine manual for that engine, I know the valve lash is real critical with a engine brake. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413111 Share on other sites More sharing options...
Blue Ox Posted January 13, 2019 Author Share Posted January 13, 2019 I have the manual and the valve lash is .02 to.028 with the jake. Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413112 Share on other sites More sharing options...
fjh Posted January 13, 2019 Share Posted January 13, 2019 (edited) BUD ! HOW ARE SETTING THESE ?????? they don't set like a Cat or other engines out there!!!!!! You need to set on the Valve set marks NOT TDC ! Not overlap , over lap is close but not perfect . the slack on certain valves is NORMAL if not on the valve set marks! the jake brakes are set on the valve set mark of each cyl Usually 15 to 22 thou! separately while setting the valves 16 in / exhast 24-26 NOT 02- 28 you now may have bent a Valve! Read the A BOOK! Your going to ruin something!!!!!! If you haven't already! firing order 153624 1-6 5-2 3-4 Are sister s these are all on the same stroke as each other but doing a diffrent job! Edited January 13, 2019 by fjh 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413129 Share on other sites More sharing options...
Mack Technician Posted January 13, 2019 Share Posted January 13, 2019 I didn’t know what to say Fred...... Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413133 Share on other sites More sharing options...
fjh Posted January 13, 2019 Share Posted January 13, 2019 (edited) 😣I SAID IT! F@@ksakes! Edited January 13, 2019 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413134 Share on other sites More sharing options...
Blue Ox Posted January 13, 2019 Author Share Posted January 13, 2019 OK thanks I obviously made a stupid mistake. Not my first probably not my last! Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413146 Share on other sites More sharing options...
Macktech689 Posted January 13, 2019 Share Posted January 13, 2019 When I first read this post I cringed, it's so easy to bend and break the valve train parts if you don't adjust that engine exactly right. Won't be the first time! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413147 Share on other sites More sharing options...
brettj3876 Posted January 13, 2019 Share Posted January 13, 2019 Check end of rocker shaft to see if the soft plug came out.If it did it should be laying there.Valve adjustments are marked on flywheel.You can start anywhere just follow firing order from there Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413158 Share on other sites More sharing options...
fjh Posted January 13, 2019 Share Posted January 13, 2019 Sorry I was abrasive but follow the directions bring it up to the valve set marks on the flywheel valves on the rock on the opposite cylinder you adjusting 1-6. 5-2 3-4 adjust the valves to 16 intake 24-26 exhaust if it has jakes usually 15 or 22 and as the post above suggest check the rocker shaft for aplugs missing!Hopfully you haven’t ruined it. Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413168 Share on other sites More sharing options...
Blue Ox Posted January 13, 2019 Author Share Posted January 13, 2019 The plugs are still in place. I screwed up the valve adjustment will redo tomorrow, hopefully I didn't break anything. Like I said stupid mistake. Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413170 Share on other sites More sharing options...
Blue Ox Posted January 13, 2019 Author Share Posted January 13, 2019 I deserve the response, I was ignorant. When I am stupid I admit it. Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413171 Share on other sites More sharing options...
Blue Ox Posted January 13, 2019 Author Share Posted January 13, 2019 I do appreciate the responses! Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413172 Share on other sites More sharing options...
fjh Posted January 13, 2019 Share Posted January 13, 2019 (edited) Your welcome Bud ! Hopefully All goes well! valve cover usually has the valve adjustments on a tag on one or the other cover! If ya need help we will try to assist! Or Get mad ! 🙄😁 Edited January 13, 2019 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413173 Share on other sites More sharing options...
Popular Post Mack Technician Posted January 14, 2019 Popular Post Share Posted January 14, 2019 (edited) Might be a good time to buy your local, firmiliar, knowledgeable, mechanic a case of Old Milwaukee and have him walk you through the steps or assist this round. Good Luck! Edited January 14, 2019 by Mack Technician 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413188 Share on other sites More sharing options...
wilbur Posted January 14, 2019 Share Posted January 14, 2019 18 hours ago, brettj3876 said: Check end of rocker shaft to see if the soft plug came out.If it did it should be laying there.Valve adjustments are marked on flywheel.You can start anywhere just follow firing order from there Is that common for the freeze plugs to come out.? That happened to me and I ended up drilling them and installing a roll pin. No problem since. Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413226 Share on other sites More sharing options...
wilbur Posted January 14, 2019 Share Posted January 14, 2019 If you go by the marks on the flywheel say 1/6 that doesnt mean you can set either. 1 or 6 could be on the overlap. If on 1/6 check both cylinders to see which is on the overlap {the valves will be partially opened}. If 1 on overlap do 6 or visa versa. Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413229 Share on other sites More sharing options...
fjh Posted January 14, 2019 Share Posted January 14, 2019 If you Go By the marks ( marked) = set valves 1-6 5-2 3-4 on the flywheel and use overlap on the opposite cyi for checking your self you will be spot on period! Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413232 Share on other sites More sharing options...
Blue Ox Posted January 17, 2019 Author Share Posted January 17, 2019 Thanks for the help. I got it adjusted and it is running great. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55282-exhaust-valve-lash/#findComment-413473 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.