Hobert62 Posted December 7, 2018 Share Posted December 7, 2018 Should of left Sam on the door. Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-410814 Share on other sites More sharing options...
Quickfarms Posted December 7, 2018 Author Share Posted December 7, 2018 Should of left Sam on the door. I would have liked to but it was all one sunbaked decal 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-410834 Share on other sites More sharing options...
Quickfarms Posted December 9, 2018 Author Share Posted December 9, 2018 Check all return lines from injectors, also the fuel delivery pump has two small plastic check valves, if they are not sealing it will lose it's prime. terry:MackLogo: I suppose you should check all fuel lines!Can someone help me identify my injector pump. The engine is a EC6-350This is the tag on the pumpWhich parts are the check valves on this schematic Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-410980 Share on other sites More sharing options...
terry Posted December 9, 2018 Share Posted December 9, 2018 No. 8 is the check valve on the inlet side, there is another under the primer, but not all pumps have the primer on them, makes it harder to prime fuel system. terry Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-410983 Share on other sites More sharing options...
Quickfarms Posted February 8, 2019 Author Share Posted February 8, 2019 According to the information I received from the Mack museum the passenger side power window unit shown in the photo was factory installed. This unit is on its last legs and needs to be replaced.Does anyone know where I can get a replacement unit?Was there originally a cover on the unit? Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415180 Share on other sites More sharing options...
Brocky Posted February 8, 2019 Share Posted February 8, 2019 Check in with Tom Millard, Oldspwr, on the Brockway site.. He put electric windows in the Brockway 361 he restored for his father. Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415195 Share on other sites More sharing options...
85snowdog Posted February 9, 2019 Share Posted February 9, 2019 I didn't realize those were installed at the factory. My 85 RD has one . I will take a pic of the cover that goes on it. I always thought it was something aftermarket because I had an international with the same thing. Quote Keith Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415263 Share on other sites More sharing options...
85snowdog Posted February 9, 2019 Share Posted February 9, 2019 Sorry, I'm mistaken. Mine is different. Quote Keith Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415268 Share on other sites More sharing options...
Quickfarms Posted February 10, 2019 Author Share Posted February 10, 2019 You never said if the truck was hard to start both cold and warm? How does it start if allowed to set for about four hours after running?Once started it is easy to start after 4 to 8 hours it does crank more than I like but nothing like first thing in the morning Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415315 Share on other sites More sharing options...
Quickfarms Posted February 12, 2019 Author Share Posted February 12, 2019 Right now I can't work on the truck until my knee heals from surgery last weekSo right now I am planning the attack on the fuel system, looking for a source for my power window motor and a 60" sleeper My bride was nice enough to take me to look at some cars over the weekend 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415473 Share on other sites More sharing options...
j hancock Posted February 12, 2019 Share Posted February 12, 2019 Better watch out! Moma appears to be giving you the signal she is going to slug you if you don't put the camera down. Sorry about the knee. Probably out of warranty at this point.. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415517 Share on other sites More sharing options...
h67st Posted February 12, 2019 Share Posted February 12, 2019 That's a good woman that will go with you to see nice cars! Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415564 Share on other sites More sharing options...
Popular Post Quickfarms Posted February 12, 2019 Author Popular Post Share Posted February 12, 2019 That's a good woman that will go with you to see nice cars! She's a keeper, June will be our 25th anniversary She even drove me there in the rain, she is a California girl that hates driving anytime it is not sunny, and had breakfast with some of my friends. She actually was interested in the pre war Indy style cars after I reminded her that her grandfather worked on what we think was the 1938 winner 3 Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415569 Share on other sites More sharing options...
Quickfarms Posted February 12, 2019 Author Share Posted February 12, 2019 Better watch out! Moma appears to be giving you the signal she is going to slug you if you don't put the camera down. Sorry about the knee. Probably out of warranty at this point..There's a warranty?How long is that for? This was my good knee 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415570 Share on other sites More sharing options...
j hancock Posted February 13, 2019 Share Posted February 13, 2019 14 hours ago, Quickfarms said: There's a warranty? There WAS a warranty. How long is that for? Warranty lasted until about 2 weeks before it started giving you issues. This was my good knee Hope the healing process goes well. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415607 Share on other sites More sharing options...
Quickfarms Posted February 18, 2019 Author Share Posted February 18, 2019 The knee is healing and I am going stir crazy not working on my projects and dealing with my clients.Today I installed a pressure gauge into the existing port on the secondary fuel filer that is after the lift pump.I tried to start the truck and it cranked for a while then lit off but died I repeated this On the third try the batteries were getting really low so it was time to disconnect them and charge them. So much for today, tomorrow is another day Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-415973 Share on other sites More sharing options...
Quickfarms Posted February 19, 2019 Author Share Posted February 19, 2019 today I got the truck running with the pressure gauge in the secondary filter. I ended up checking the fuel filters and the primary was 1/2 full and the secondary was about 3/4 full so I toped them off, added about 9 gallons of fuel, and it was able to be started. The fuel pressure is about 16 psi at 800 rpm and when I increase the rpm's it goes up to about 21 psi When I shut the truck off it drops to zero by the time I climb down and get around to the filters There are to visible fuel leaks any place that I can find Any thoughts where to check now? Several posts to this topic on or about 2/9 about this starting issue have disappeared! Who deleted them? And why? Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-416011 Share on other sites More sharing options...
j hancock Posted February 19, 2019 Share Posted February 19, 2019 Have you looked at the inlet (check) as Terry suggested above? It is to keep the fuel primed in the system. The author of a post can also delete them. As to why, I don't know. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-416045 Share on other sites More sharing options...
Quickfarms Posted February 19, 2019 Author Share Posted February 19, 2019 Have you looked at the inlet (check) as Terry suggested above? It is to keep the fuel primed in the system. The author of a post can also delete them. As to why, I don't know.Not yetWill a lift pump still pump if the check valves are bad?If the check valve is bad the efficiency of the pump should be greatly reduced.I was hoping that the fuel pressure gauge would give me some instead to the condition of the lift pump.The nice part about this truck is that the fuel filters are readily accessible sitting on the outside of the frame This makes it a project to get to the lift pump that is now hidden behind the fuel filters.Looking at it it looks like the best way to get to the lift pump is to remove the fuel filters for access. I am to the point of being frustrated and thinking about just replacing the lift pump and all of the fuel lines Does anyone know what the PAI part number for the lift pump and rebuild kit? Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-416052 Share on other sites More sharing options...
j hancock Posted February 20, 2019 Share Posted February 20, 2019 Best to confirm your numbers with a PAI dealer for the pump or kit. "Thinking" the kit is EKT-2221 and the pump is ESP-3581. The fuel psi specs are 17-31 for your engine. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-416214 Share on other sites More sharing options...
Quickfarms Posted February 21, 2019 Author Share Posted February 21, 2019 Best to confirm your numbers with a PAI dealer for the pump or kit. "Thinking" the kit is EKT-2221 and the pump is ESP-3581. The fuel psi specs are 17-31 for your engine.Where did you find those fuel specs?My manual does not cover the EC6 350 Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-416321 Share on other sites More sharing options...
j hancock Posted February 22, 2019 Share Posted February 22, 2019 I got the info out of a 1985 Mack Tune-Up Specification manual. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-416346 Share on other sites More sharing options...
Quickfarms Posted February 22, 2019 Author Share Posted February 22, 2019 I got the info out of a 1985 Mack Tune-Up Specification manual.Thanks, another Mack manual I did not know existed that I now want. Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-416356 Share on other sites More sharing options...
Quickfarms Posted February 22, 2019 Author Share Posted February 22, 2019 I was able to locate one new power window motor and it arrived today 2 Quote Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-416357 Share on other sites More sharing options...
j hancock Posted February 22, 2019 Share Posted February 22, 2019 Here is the manual and number. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/54779-1985-rs688lst/page/2/#findComment-416376 Share on other sites More sharing options...
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