Messages

1

Engine + Driveline / M42 low compression cyl4

« on: September 23, 2010, 01:07:34 AM »

That's what I thought. But was told that a lifter wouldn't cause a valve to stay open.
It's one of the intake valves.

2

Engine + Driveline / M42 low compression cyl4

« on: September 22, 2010, 11:39:54 AM »

Ok so the valves on cyl 4 never close all the way when the cams are installed. But when there not the valves seal perfectly. Keep in mind the head was inspected and tested by napa. What the heck.

3

For Sale / FS fuel injectors

« on: September 21, 2010, 01:38:34 PM »

still have the injectors?

4

Engine + Driveline / M42 low compression cyl4

« on: September 20, 2010, 09:56:02 PM »

I have heard the same things.. Im gonna do the leak down tomorrow.

5

Engine + Driveline / M42 low compression cyl4

« on: September 20, 2010, 09:42:54 PM »

I didnt take much off at all. let me add that the motor had this problem before the motor was ever torn down.

6

Engine + Driveline / M42 low compression cyl4

« on: September 20, 2010, 08:00:49 PM »

I would get 30psi cold and 180+ on the others then put some oil down there and I got around 150psi cold. Checked the timing many many times. Seems that the rings aren't sealing. But I don't understand why everything looks great.
I Replaced all the lifters too. I'm ready to crush this car with my jeep. Lol
Any ideas?

7

Engine + Driveline / M42 low compression cyl4

« on: September 15, 2010, 12:44:27 PM »

Hi, I'm new to this forum.
I am havin some issues with my 91 318i.
First, I bought it with a cracked head that was leaking coolant outside the engine.
Bought a used head and had it cleaned, inspected and pressure tested. Everything checked out great.
Honed the cylinders and installed new rings because before it was torn down it had low compression in cylinder 4.
So now it's back together with all new gaskets and
seals.
Still has compression issues in cylinder 4 what's goin on?!?!
Could a falty lifter cause low compression?
I'm stumped any help would be great.
Thanks.