Join Date: Sep 2006
Location: Mascoutah, IL
Thanked 0 Times in 0 Posts
Trouble cranking when warm!
Yeah, I know this one sounds backwards, but it's my daily driver and I'm afraid I'll find myself walking to work one day soon if I don't figure it out. First thing in the morning, the engine cranks fine. (even if I have to start it 2 or 3 times. It's been fairly cold out here in S. Illinois lately.) If the engine's warmed up good, and I park it for a short period (10 min. - 3 hours?) it barely turns over enough to start. Sometimes it sounds like I barely get in one revolution. Just when it seems the starter has given up, and comes to a complete stop, the engine comes to life, and runs fine. It's a 77 CJ-7 with late 60's or early 70's GM 350 (Yes Jim, it's got the Quadratrac transfer case.)
Any ideas? I'm pretty stumped. I only have two theories, and both are quite a stretch.
WAG 1) The engine is running way too hot, and nearly seizes up if it hasn't had time to cool back down. (factory temp gauge read hot, $10 WalMart replacement reads cold, I haven't had the Jeep long enough to have a good feel for what's normal, but the radiator gets plenty warm, so I know the water's flowing.)
WAG 2) I know the timing chain has better than 1/2 inch of play in it. I don't think I'm hearing a rod slap, but when the engine is warm I do have some sort of knock when its under a load. Could the timing chain be stretched so far that it's firing the piston while it's still on the up-stroke?