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Engine derped really hard. Tryna find out what's wrong.

I actually got a 4x4 4.0 '91 Cherokee off CL for $500, owner said it had a bad engine, was knocking pretty loud. Got it home, did some troubleshooting and found the crank pulley was bad (separated from the rubber, no noise with belt off), swapped it out and drove it to work for a while. Eventually sold it to my mother in law, who finished it off in a year or 2, with almost 250k on it.
 


we need a mod to change the title of this thread.

it should be,

owner derps out and fails even try to investigate bad sounds, then tears the engine down. and now what?
 
ScottyDoggs said:
we need a mod to change the title of this thread.

it should be,

owner derps out and fails even try to investigate bad sounds, then tears the engine down but actually tears it down two days later after some some suggestions are given. and now what?
Click to expand...


Fixed that for you.
 
that works too. he was all to eager to rip his engine apart if you ask me.

lets hope he can put it all back together again lol


at this point a used engine maybe in order.....
 


Here I am fighting tooth and nail trying to keep my heads on and this guy just chunks them off like a Coed during Mardi Gras looking for beads
 
your killing me. so true tho.....lmao!

maybe hes not heard they rarely blow head gaskets?


got to admire his enthusiasm tho. dove right the f in blind as a bat lol
 
I wonder if there's going to be a huge part out after he realizes it's going to cost him about $300 just to get them heads back on only to find out it was the tensioner all along.
 
nah, head gaskets and new bolts under 60, lim gaskets another 40 or so. then fluids.

full gasket kits to do the whole engine and new fluids and elbows ran me just over 200 bucks.
 


Yeah I wouldn't bolt on a set of heads without at least a resurface, guides inspected, new seals, and 3 angle valve job. Probably new springs too while I had it all apart and doing seals anyways.
 
they looked good with a metal straight edge, they came off a running jy engine. last owner took them off to use his heads he had already. so they got cleaned up and bolted back on. 500 miles later shes still tight and running well.

i did lightly port em, new seals, and lapped the valves too.
 
I pulled the 181k mile heads off my black gtp, stored them in my shed for about a year, then slapped them on a l26 and ran them for 30k miles and had no issues.

Sent from A Galaxy Far Far Away
 
I had a non-Pontiac engine make similar sounds (as you describe them anyhow) and it was the timing chain jumping a tooth. Kinda uncommon though.
 
Slick2500 said:
I pulled the 181k mile heads off my black gtp, stored them in my shed for about a year, then slapped them on a l26 and ran them for 30k miles and had no issues.

Sent from A Galaxy Far Far Away
Click to expand...
Now that is pure luck, but it's dry enough where you are at that the heads won't rust solid in that time. Here if you have exposed steel it will start to rust before you can get primer on it.

Bobc455,

How, with what I would assume was a worn out timing set and have it jump full retard by a tooth still manage to keep the engine running?

Jeff
 


As the car is going to get a top swap, the heads needed to come off anyways, and this was a good reason to get them off. I plan to pull the block out, take the front and rear covers off, and the pan next week, which should tell me what actually happened.
 
when my ac went to crap it made god aweful noises. at first a thought it was the supercharger coupler. sometimes it rattled and sounded like rocks in a can , sometimes it made a grinding noise. then i seen the metal shavings on the ac pulley , so i yanked the compressor and put in an ac pulley delete...no more noise.
 
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