Hey there! I hate that my first post is going to be a troubleshooting issue on here, however I guess thats just how it goes sometimes....so, the dilemma. I read about these amazing little 1.6 diesels and fell in love...after doing some searching a friend told me about one that was sitting out at a dealership. I ended up purchasing a 1992 Jetta turbo-diesel (eco-diesel model) for a total of about 600 dollars. High miles but the test drive told me otherwise, seemed solid...minus the few things it needed. Since then I have replaced parts and am now just waiting on several bolts before I start driving her. Along the way I decided to run a compression test and then it all came to a somewhat discouraging halt when my numbers came back, 350-150-180-200.
Yikes! So, the question I'm asking is - Will compression numbers be significantly higher with a warm engine? since the vehicle can not be run right now I can not find out until the end of the week when the rest of my parts come in.
Thanks!
Yes, it will trend higher. If it starts and runs without difficulty then run it for a few weeks before testing again. There may just be some foreign matter on the valve seats or some stuck rings. If there is still the difference then maybe a valve job and or rings is in order.
Hmmm... I remember seeing some compression numbers on a toyota diesel 2.4D engine.
Compression went like this: 320-190-140-90
(not exact numbers, but close enough)
The engine wanted to run, but blew out some serious black smoke.. that one cylinder was trying to run the whole motor :lol: what a beast!
Basically what probably happened was the driver let the EGT's go too high, and burned out the last 3 cylinders, since thats the orientation of the exhaust manifold.
I'm wondering if your car has the same problem. The most problematic cylinders of heat failure would be the 2 middle ones by the way that the exhaust manifold is ducted. As Doug stated though, it is quite possibly a valve/ring problem, maybe caused by overheating.