Well I did a compression test a couple of months back, the right bank were all 150psi, the left 140psi, with my dyno chart showing 20hp or so down looks like the cam timing off. This with the long standing issue of low oil pressure when hot, intake needing finishing made me think lets just yank it out, go through it and be done.
One other item I can get done is the head gaskets, if the condition of these is like the other seals I have been replacing ... nice and strong for the supercharger kit.
List of to do so far:
Well looks like I have finally found the cause of the oil pressure not being quite right, check out the pictures of the main bearing shells below. Current thought as to what caused this is that the PO who replaced the engine did not flush out the oil cooler and lines and the debris caused the damage. Would explain why rod bearings were not trashed.
So Crank is back and machined down to -0.25mm which is the 1st oversize, bearings are on back order so time for some cleaning.
While there were some metal parts hanging around decided to get some more plating done.
All pistons are clean now, I heard today that new bearings are on the way after waiting for a new 0.25 undersize thrust from Germany. I started on the heads ... so far just the passenger side, I found one keeper looking for a home though .. and while playing truant it got a good thrashing from the hydraulic lifter ... a new keeper on the way.
Head ready for one last clean after lapping all the valves | |
One Inlet seat has seen better days but it will have to do for now. |
Well passenger head is all re-assembled except for the one valve where I need a new keeper.
Well while this was going on I took the intake to be powder coated, they did a great job. It cost more to have the old paint stripped off than it did for the actual painting. In the engine gasket set where new seals for the side of the intake which was a pleasant suprise.
Well the bearings came, whohoooo !!
Here is the crank inserted in the block, ready for its other half | ||
Here is the cradle with bearing lube then Loctite, need to look careful as the light isn't too good in these shots. | ||
All assembled. |
OK I am just going to let the pictures tell the story from here on in.
As of 3/21/04 I have driven 12 or so miles, there is a slight coolant leak from the Water Pump but otherwise so far so good. AND oil pressure is now normal !! A hair under 3bar at idle and a full 5 bar at 2K, whohoooo !!
3/23/04 ~100 miles. No 8 Cylinder has a black plug, going to be checking ignition and injector.
Compression Tests, before and after rebuild
Cylinder | Sept 2003 | 50miles | 500miles | 1000miles |
1 | 140 | 165 | ||
2 | 150 | 160 | ||
3 | 150 | 160 | ||
4 | 150 | 160 | ||
5 | 140 | 160 | ||
6 | 140 | 160 | ||
7 | 140 | 160 | ||
8 | 140 | 160 |