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2.5 Liter solid lifter valve tool
Posted 17 April 2004 - 02:49 PM
Posted 17 April 2004 - 08:35 PM
Posted 18 April 2004 - 08:36 PM
Should have measured valve to cam clearances before dissembly of heads. Did measure all valve shims before re-installation of cams. In the process of moving some shims around, will have to buy at least several shims. Did notice that after 137,000 miles that most valves are still very close with most exhaust between 9 and 10 mills of gap and intake 7-8 mills. Spec's are 10 and 8 mills so they very close. I've used synthetic oil for life of vehicle so that might have helped.
Thoughts on causes of gasket failure. I've read alot of the other posts on this. I noted that the my gasket failed at the bottom of the cylinder, where this is almost certainly coolant even if you have even a half full system. I changed water pump about a month before head gaskets failed. Did this just because I was replacing a front drive shaft seal and timing belt (at 137,000 miles). Did every thing aftermarket manul suggests about getting any air out of system including using blead plug on passengers side of radiator. However, I still think there might have been air in the system for the following reasons.
The engine tilts up at the front by about 15 degrees. The crossover water coolant pipe between the two heads (it is hidden under the intake manifold) connects the rear two cylinders together. the crossover pipe then extendeds upward at about the 15 degree angle to the hose that attaches to the passenger side of the radiator. With the upward tilt of the engine, the front two cylinders could still have air trapped at the top of the cylinders, especially if you are refilling the system with the front end of the car off ground as one normally does if you have to get under car to replace the water pump.
It Might make sense to point the nose of car slightly down hill when burping the system. Also have the right side of the car slighty elevated as tha is where the air would make its way to the radiator.
Secondly, I noticed that the cylinders are siamesed together so that no coolant flows between the them. Infact the iron cylinder liners are almost touching. Cylinders also cast with so that the are directly connected to the side of both cylinders to the block. the lack of coolant all the way around the cylinder wall can lead to uneven expansion of the cylinder wall. And since the cylinders are "constrained" at both their right and left sides, they will expand more at the top and bottem of the cylinders when the get up to operating temperature.
Would like to know if the 2.2 liter engine has siamesed cylinders. We have a 90 legacy with 193,000 miles with virtually no problems.
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