My last oil analysis came back with a small amount of coolant in the oil, so I started down the path of tearing down my engine. 152k on the odometer, I've owned it for the last 45k, so I'm assuming this is the first time the valve cover & head have been off. Here is what I found during the teardown:
- After pulling the timing belt I found the crank was still able to turn with the flywheel locking pin installed, does this mean I'm 180° off where I was supposed to be? Should I turn the crank 180° now before reinstalling the belt to get the locking pin to hold or will this mess up the fuel pump timing?
- The hex plug for the locking pins on my valve cover took a 5mm Allen wrench, strange because every write up listed them as 6mm.
- Two bad rockers, one was missing the roller pin (exhaust #3) and the other was very sloppy with needles moving around (exhaust #4). All of the other rockers (except two tight ones) had some minor play on the roller. A couple of the cam lobes will need to be polished up.
- From looking at the head gasket and top of the block, it appears coolant was seeping into the combustion chamber through the gasket, so I'm hoping new gasket will solve my issue.
- Original Ceramic glow plugs were still intact, but had problems with plug #2 stripping out (started easy but gained resistance after a few turns), will need to figure something out here, open to suggestions.
- Most all of the head bolts came out with ~100-120 ft-lbs of torque.
- There was a good coating of sludge on the intake ports and on the FCV, but not as bad as some pics I've seen.
- Cylinders #1-#3 were pretty clean and shiny, but #4 had a more dull appearance to it, not sure if this could be an injector issue or if its related to the bad rockers, which is strange because the bad one from #3 was in worse shape than the bad one from #4.
- Should I consider replacing my exhaust valves (and intake as well)? I seen some recent chatter about valves breaking.
From here I'm planning on taking the head into a machine shop to do a pressure test. Will also look into getting my injectors tested. Will need to order parts and start putting everything back together. Along with head gasket looking at doing 5V steel glow plugs, new rockers, and ARP studs. I've been scanning old threads, but any advice on prep and reassembly would be greatly appreciated!