new guy with a questions on 2.7 D.O.H.C.
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Joined: Mar 2014
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rattle response
I pulled the front valve cover off, the timing chain on the camshafts is nice and snug, and what I could see from the main chain, it also appeared snug. Little sludge build up, but, overall pretty minor.
Put everything back together, it still rattles, and almost sounds like it is coming from under the front valve cover, kind of in the center. I know sound travels though.
If you listen past the rattle, the motor seems to be running good, and there is no vibration.
The rattle is driving me crazy though. It is NOT always there. At idle it will sometimes fade away, then return. If you rev up the motor the rattle speeds up, but, again, is not always consistent. Sometimes it will rattle, sometimes not, but, most of the time it does.
I have been told it could be the timing chains, or a bad intake manifold that has partially broken apart on the inside.
I would rather fix this myself, and not have to pay the dealer. Is there any more thoughts or inputs on what this might be. The car is in absolutely great shape, and I would like to fix it if it does not get to expensive.
Thanks
Put everything back together, it still rattles, and almost sounds like it is coming from under the front valve cover, kind of in the center. I know sound travels though.
If you listen past the rattle, the motor seems to be running good, and there is no vibration.
The rattle is driving me crazy though. It is NOT always there. At idle it will sometimes fade away, then return. If you rev up the motor the rattle speeds up, but, again, is not always consistent. Sometimes it will rattle, sometimes not, but, most of the time it does.
I have been told it could be the timing chains, or a bad intake manifold that has partially broken apart on the inside.
I would rather fix this myself, and not have to pay the dealer. Is there any more thoughts or inputs on what this might be. The car is in absolutely great shape, and I would like to fix it if it does not get to expensive.
Thanks
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Finally got around to working on it. Pulled the timing cover off, and all the chains are nice and snug. No wear there at all. Not sure if they were replaced before. Going to pull the oil pan next, and check the bearings.
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Well, another update. Turns out the front camshafts are out of time. With the crankshaft timing set right on the colored link, and the upper camshafts timed right on the colored links, turns out the camshaft marks are not at 90 degrees to the gasket mating surfaces. If you envision 90 degrees to be at the 12 o'clock position, the marks are at the 1 o'clock position. And the primary chain tensioner seems to be sticking out pretty far. Luckily compression is at 115-120 pounds on the cylinders though. Soooo, looks like it is timing chain time.
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UPDATE:
So, re did the timing chain, guides, and tensioner. Still had the hard knock. Pulled the oil pan, and rod caps. Turns out I had trashed bearings. Some time later, I now have a completely "new" rebuilt motor. Pulled it out, stripped it down, and went to work on it. Had the block hot tanked, and bored 20 over. New crankshaft, new pistons, 2 new rods, new water pump, new thermostat, new gaskets, new plugs, you get the idea. Pretty much everything I could replace in the motor, I did. Re-installed the motor. Purrs like a kitten. Re-did all the brakes, calipers, pads, and rotors. New tires.
Got myself a brand new low mileage sporty little car now. Thanks for everyones help and input.
So, re did the timing chain, guides, and tensioner. Still had the hard knock. Pulled the oil pan, and rod caps. Turns out I had trashed bearings. Some time later, I now have a completely "new" rebuilt motor. Pulled it out, stripped it down, and went to work on it. Had the block hot tanked, and bored 20 over. New crankshaft, new pistons, 2 new rods, new water pump, new thermostat, new gaskets, new plugs, you get the idea. Pretty much everything I could replace in the motor, I did. Re-installed the motor. Purrs like a kitten. Re-did all the brakes, calipers, pads, and rotors. New tires.
Got myself a brand new low mileage sporty little car now. Thanks for everyones help and input.
