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'94 Montero DOHC 24 Valve V6 3500 Rattle

There is a loud rattling coming from what appears to be the right side cams of the car, right below the intake manifold. Rattling increases proportionally with the RPMs. Force is lost when rattling appears. Also, the mixture seems to be coming out very rich from the exhaust. Could this be related to valves, camshafts, and timing belts? Thanks in advance.

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This is tricky without a great deal of additional information. If it runs rich there is a possibility that the oil is becoming diluted and thus losing viscosity. Check the oil dipstick and see if the level is high and smells like gasoline. This will indicate that there is fuel mixing the oil. That's the first thing that comes to mind.

Posted on Mar 23, 2014

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Posted on Jan 02, 2017

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Pyrhyc
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SOURCE: 1997 montero sport ran hot

I would say that the overheating was due to the thermostat, and that you've already done catastrophic damage. It's sounds like you've blown a head gasket, and possibly damaged a valve, rocker, lifter, push rod, or spun a crank bearing. If the rattle is coming from the top of the engine, it will be a valve, push rod, lifter, or rocker. If it's coming from the bottom, then it's a bearing. You should have a mechanic check it. When at idle take the radiator cap off, if you have any blow back, pressure, or bubbling, then you've blown a head gasket.

Posted on Jul 27, 2008

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