yxmj Posted November 10, 2015 Posted November 10, 2015 By the description given.....it is a lack of compression that is the problem.....but maybe I read it wrong . :MJ 1: .
Eagle Posted November 10, 2015 Posted November 10, 2015 I believe what we have here is a failure to communicate.
87MJTIM Posted November 10, 2015 Posted November 10, 2015 I light of the current political season, the OP spoke as well as the candidates, but with fewer words. :laughin:
parkia86 Posted November 10, 2015 Author Posted November 10, 2015 Lol looks like the post didn't go through... again ... the issue is i have low compression on 3 cylinders ( all at 100psi)... I put in a tbsp of motor oil in each cylinder and the engine fired right up... stronger than ever... while it was running i put a bottle of restorer in the engine and i ran it about 100 miles or so... it still starts right up... I am assuming that my piston rings are shot... I still have a "Valve Tapping" noise coming from the engine... How much longer do you think this baby will run?
yxmj Posted November 10, 2015 Posted November 10, 2015 What motor? and since jeep did not come with a 3 cylinder... what is the compression on the other cylinder(s) the question would be the difference in compression comparing all across the motor
parkia86 Posted November 10, 2015 Author Posted November 10, 2015 its the jeep 4.0L in a 1987 Comanche... all of the other cylinders were 120psi ... so about a 20% difference. Sorry for not including that!
ParadiseMJ Posted November 10, 2015 Posted November 10, 2015 I am assuming that my piston rings are shot... I still have a "Valve Tapping" noise coming from the engine... How much longer do you think this baby will run? I have had the "tapping" in my XJ for years... I've had the tapping in my MJ since I got it 4+ yrs ago. I've re-done the head, new guide seals, new lifters, cleaned the engine a couple times, keep good oil and good filters in it...and they both still have some tapping. 90 XJ has 271K on clock and still strong. 88 MJ has 195K and is (and always will be) a work in progress. Unless it is giving you trouble or smoking or losing power...who know how long it can go for. You can always drop a new engine in it, or transmission, or whatever. The only thing that would make me throw in the towel would be rot and rust...and even that can be fixed.
yxmj Posted November 10, 2015 Posted November 10, 2015 Rule of thumb is 10% deviation in compression...but I was never much for rules..... . :MJ 1: . I am unclear on the problem....if it is running strong as you say....is it the tapping that concerns you...if so see above...I can see if i can find a link (cuz I am too lazy to type it) for an engine cleaning regime I do often...try it...can't hurt... :dunno:
parkia86 Posted November 10, 2015 Author Posted November 10, 2015 Please post that engine cleaning regimen .. that would be helpful. I'm mostly worried about a piston skirt being broken but i hear those are not as common in the older jeep
yxmj Posted November 10, 2015 Posted November 10, 2015 If you want the engine cleaming method go to the main forum page....in the search bar type in "kitchen sink" click search.... go to the 5th post down from Zack....it is typed there.... if nothing else dump your oil today.....get a strainer or even a rag over a pail and pour your old oil through it....if a skirt is broken you will have shrapnel for sure...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now