Hot engine won't start?

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   Also, at end of day, parked it, then turned the key off. On a whim, tried to start and she groaned a bit, but did start and run........even when hot. Extra juice in the battery may have been a factor. 

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modirt Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 18 Jul 2018 Location: Missouri Points: 8487	Post Options Post Reply Quote modirt Report Post Thanks(0) Quote Reply Posted: 25 Jun 2025 at 9:29pm
	Also, at end of day, parked it, then turned the key off. On a whim, tried to start and she groaned a bit, but did start and run........even when hot. Extra juice in the battery may have been a factor.

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modirt Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 18 Jul 2018 Location: Missouri Points: 8487	Post Options Post Reply Quote modirt Report Post Thanks(0) Quote Reply Posted: 26 Jun 2025 at 3:08pm
	Quick update. Pulled the battery and had it tested and they said still good. Was low on charge, but voltage output tested OK. Battery cables were #4 and negative was grounded to the engine block. Cables corroded, so have upgraded to new #2 cables. Will install those on the existing battery. If memory serves, 725 cold cranking amps. They sell one with more CCA's that sits in same foot print. As is, the battery box is full. BTW, forgot but there is a 2nd battery box. So may have been setup to run a 2nd battery in parallel for running lights at night. Existing alternator......one in the video......despite being large in physical size is only putting out 30 amps or so. Since it has been causing trouble anyway, new 90 amp single wire (self regulated) alternator on order. Local NAPA can make me new charging wire.........thinking #6 AWG wire to handle the loads. Will make those changes, then see what happens.

Ed (Ont) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 Nov 2009 Location: New Lowell, Ont Points: 1474	Post Options Post Reply Quote Ed (Ont) Report Post Thanks(0) Quote Reply Posted: 26 Jun 2025 at 9:59pm
	That sounds like good changes. Bigger battery cables should help. 30 amp alternator is not a whole bunch but a lot of alternators back in the day were in that range. Chev in the 70's were 37 amps. I plowed snow with a 77 GMC with 37 amps. We would stop in the middle of the night when the lights got so dim you could not see. Park truck and let it run and go for a coffee. Then work again!!! Lol.

WF owner Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 May 2013 Location: Bombay NY Points: 4956	Post Options Post Reply Quote WF owner Report Post Thanks(0) Quote Reply Posted: 27 Jun 2025 at 6:01am
	Probably not the same problem, but years ago (80's), I had a Chevy motorhome that never wanted to start when it was warm. The starter was very close to the exhaust. With the setback style of the engine, engine compartment heat was always a problem. I tried various attempts at heat shielding and only ever managed to make the problem worse. A local electrical shop rebuilt the starter, and I had no more problems.

modirt Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 18 Jul 2018 Location: Missouri Points: 8487	Post Options Post Reply Quote modirt Report Post Thanks(0) Quote Reply Posted: 27 Jun 2025 at 8:06am
	Bad starter could be part of problem, but in this case, not from the exhaust. Open air mounting and this one has a pair of cherry bomb glass packs on duel exhaust pipes. Somebody had a sense of humor. I added turnouts so the hot exhaust didn't hit rear tires directly.

TedN Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 30 Apr 2025 Location: Central WA Points: 53	Post Options Post Reply Quote TedN Report Post Thanks(0) Quote Reply Posted: 27 Jun 2025 at 10:34am
	Fix the (now) known alternator issue, replace the cables, and see if that solves the problem. Looks like it uses an electric fan, that will speed up a little too. I think if I were working on it I would get some convoluted tubing and zip ties and get some of the wiring cleaned up a little while doing it. A few extra minutes gains quite a bit of piece of mind. Its neat to see something like that out being used, and it works for what you are doing. Ted Edited by TedN - 27 Jun 2025 at 10:38am
	190XTD seriesIII, 190XTD seriesI, maroon belly 7000, 190XTD series??? project(or maybe parts)

modirt Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 18 Jul 2018 Location: Missouri Points: 8487	Post Options Post Reply Quote modirt Report Post Thanks(0) Quote Reply Posted: 9 hours 34 minutes ago at 5:37pm
	Quick update. Got the #2 battery cables installed, then put battery charger on and left it overnight. Battery needed it. Got a chance to get it all back to normal and hit starter. Volt meter went from 12 volts to 10 (had been dropping below 6 volts), engine turned over way faster than had been before and once she started, volt meter quickly climbed up to over 14.......so alternator was trying to charge. New alternator has arrived, currently waiting on mounting brackets to install it. Also, as mentioned before, part of fuel line was lacking insulation, so that has been replaced. For first time I also noticed that the 2 or 3 inch area where the insulation was missing passed within about 2 inches or so of exhaust manifold, which is likely why it was cooked off. New high temp insulation on it now. Old alternator is unable to keep up with any type of load, so belief is under normal operation was getting a slow battery drain. With any lights on, drain was killing the battery. Hoping new alternator fixes that. Will see.

Ed (Ont) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 08 Nov 2009 Location: New Lowell, Ont Points: 1474	Post Options Post Reply Quote Ed (Ont) Report Post Thanks(0) Quote Reply Posted: 5 hours 44 minutes ago at 9:27pm
	Sounds good. Voltage should be about 13.6 to 14.5 with engine running so the alternator seems to be good. Or does it drop when you turn some accessories on?