By XR4Tim - Thu Nov 21, 2024 1:31 pm
- Thu Nov 21, 2024 1:31 pm
#287331
Yesterday I went back out to work on the 456 GT. While doing the cam belts, I noticed an oil leak from behind one of the lower cam drive gears. Parts diagrams showed an o-ring in front of the bearing for that timing gear, so I ordered a new o-ring, and the special ring nut tool to remove the gear. Upon removing the cam drive gear, I found no o-ring, and not even enough room for an o-ring to fit. Extensive research led me to the conclusion that the parts diagram was wrong, and there is not supposed to be an o-ring at that location. The bearing is supposed to be a sealed unit that is internally greased (like a factory IMS bearing on a 996). The fact that engine oil was leaking out of it meant that the grease seal had failed and the bearing was being washed out. So I ordered a new bearing from England and a special bearing puller from Germany, and replaced the bearing yesterday.

While I was there, I was asked to look at a Diablo 6.0 that was throwing misfire and lean fault codes, and was making a whistling noise once the engine warmed-up, which continually got louder. I found an air leak at one of the intake plenum gaskets, and ordered the parts needed for the replacement.


While I was there, I was asked to look at a Diablo 6.0 that was throwing misfire and lean fault codes, and was making a whistling noise once the engine warmed-up, which continually got louder. I found an air leak at one of the intake plenum gaskets, and ordered the parts needed for the replacement.

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