Shattered (question about S3)
06-01-2016, 07:41 AM
#16
Three Wheelin'
Thread Starter
Scott
Any chance this is a head gasket problem rather than bore damage - maybe the length of time sitting has caused gasket failure. The oil in the manifold could be a problem with the breathers - one way valve problem or just attached to the wrong connection.
Run through some less major issues first.
Any chance this is a head gasket problem rather than bore damage - maybe the length of time sitting has caused gasket failure. The oil in the manifold could be a problem with the breathers - one way valve problem or just attached to the wrong connection.
Run through some less major issues first.
06-01-2016, 07:54 AM
#17
Rennlist Member
Scott,
Have you considered doing a leakdown test? If nothing else it will indicate whether your low compression cylinder is leaking to the inlet tract, the exhaust, the crankcase or combination thereof.
Other possibilities might include something [coke?] trapped under a valve seat or a burnt out valve.
Rgds
Fred
Have you considered doing a leakdown test? If nothing else it will indicate whether your low compression cylinder is leaking to the inlet tract, the exhaust, the crankcase or combination thereof.
Other possibilities might include something [coke?] trapped under a valve seat or a burnt out valve.
Rgds
Fred
06-01-2016, 10:26 AM
#19
Rennlist Member
No idea if you have done this before but I did a thread on this FYI. Helps to put some paint or chalk marks at 90 degree intervals on the crank pulley.
Again the motor should be warmed up for reliable results.
https://rennlist.com/forums/928-foru...n-testing.html
Main points to note are the need to do each cylinder at TDC on the firing stroke. The crank will still have a tendency to rotate so either fit the crank locking tool or do what I did and hold it with a big wrench/lever. I use a pencil to determine when TDC is present but anything soft will suffice.
My compressor trips at 110 psig so I would let it run down to 90 psig to keep a minimum of 10 psi differential over the leak down pressure that I used at 80 psig. If my compressor had a higher pressure it would have been nice to use 100 psig and then the leak down would be a direct read off the gauge but fortunately they taught me arithmetic at school!
Keep us posted as to how you get on.
06-01-2016, 01:30 PM
#20
Captain Obvious
Super User
Super User
Fingers crossed for ya!
No idea if you have done this before but I did a thread on this FYI. Helps to put some paint or chalk marks at 90 degree intervals on the crank pulley.
Again the motor should be warmed up for reliable results.
https://rennlist.com/forums/928-foru...n-testing.html
Main points to note are the need to do each cylinder at TDC on the firing stroke. The crank will still have a tendency to rotate so either fit the crank locking tool or do what I did and hold it with a big wrench/lever. I use a pencil to determine when TDC is present but anything soft will suffice.
My compressor trips at 110 psig so I would let it run down to 90 psig to keep a minimum of 10 psi differential over the leak down pressure that I used at 80 psig. If my compressor had a higher pressure it would have been nice to use 100 psig and then the leak down would be a direct read off the gauge but fortunately they taught me arithmetic at school!
Keep us posted as to how you get on.
No idea if you have done this before but I did a thread on this FYI. Helps to put some paint or chalk marks at 90 degree intervals on the crank pulley.
Again the motor should be warmed up for reliable results.
https://rennlist.com/forums/928-foru...n-testing.html
Main points to note are the need to do each cylinder at TDC on the firing stroke. The crank will still have a tendency to rotate so either fit the crank locking tool or do what I did and hold it with a big wrench/lever. I use a pencil to determine when TDC is present but anything soft will suffice.
My compressor trips at 110 psig so I would let it run down to 90 psig to keep a minimum of 10 psi differential over the leak down pressure that I used at 80 psig. If my compressor had a higher pressure it would have been nice to use 100 psig and then the leak down would be a direct read off the gauge but fortunately they taught me arithmetic at school!
Keep us posted as to how you get on.
06-01-2016, 02:18 PM
#21
Rennlist Member
06-06-2016, 10:39 AM
#23
Rennlist Member