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Omega General Help / Top end rebuild problem
« on: 22 November 2010, 22:06:53 »
It has been an on / off project for the last 6 months on my 3.0 V6, where I suspected the head gasket had gone on the near side bank of cylinders . It had, the near side gasket around the exhaust ports on both front and rear cylinders. The gasket had disintegrated in this area on both cylinders, with some slight pitting on the head. The offside gasket was also not in great condition, but has not been leaking.
I've had both heads lightly skimmed, so they match and rebuilt the engine. All new top end gaskets and stretch bolts for cylinder heads. I've also redone the oil cooler gasket, new thermostat, water pump, plugs, leads, new stretch bolts for the cam sprockets, new cam belt and tensioners (I found the oof cambelt dvd excellent and very helpful).
However, all was well on starting up apart from a engine rattling sound on tickover, which largely disappears from about 1500rpm when you rev the engine. I don't want to drive the car until I have identified the problem, in case I done something stupid on the rebuild which causes major engine problems. I thought it might be a lack of oil in a cam follower, but after leaving the engine running for about 30 mins to get rid of air from cooling system and checking the running temperature was ok, the knocking sound is still there.
I've run the engine a couple more times but no change to the knocking sound. I tried going around the engine listening with a screwdriver with no definite conclusions, but think it might be from the near-side bank of cylinders, towards the front.
Any help or suggestions would be much appreciated?
I've had both heads lightly skimmed, so they match and rebuilt the engine. All new top end gaskets and stretch bolts for cylinder heads. I've also redone the oil cooler gasket, new thermostat, water pump, plugs, leads, new stretch bolts for the cam sprockets, new cam belt and tensioners (I found the oof cambelt dvd excellent and very helpful).
However, all was well on starting up apart from a engine rattling sound on tickover, which largely disappears from about 1500rpm when you rev the engine. I don't want to drive the car until I have identified the problem, in case I done something stupid on the rebuild which causes major engine problems. I thought it might be a lack of oil in a cam follower, but after leaving the engine running for about 30 mins to get rid of air from cooling system and checking the running temperature was ok, the knocking sound is still there.
I've run the engine a couple more times but no change to the knocking sound. I tried going around the engine listening with a screwdriver with no definite conclusions, but think it might be from the near-side bank of cylinders, towards the front.
Any help or suggestions would be much appreciated?