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Old 03-30-2004, 08:17   #1 (permalink)
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Rod Bearing or Carbon Knock - 1991 -302

Please help me! It's in a 91 Mercury Grand Marquis, 302, 57000 miles. Car was run on a lot of short trips by original owner and now by us. Doesn't seem like a rod bearing should be bad already. Noise comes and goes, but is happening more often and longer. Is there anything I can run through gas to remove carbon? Thank you for the assistance. Barns1
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Old 03-30-2004, 10:51   #2 (permalink)
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Re: Rod Bearing or Carbon Knock - 1991 -302

First up try a bottle of Chevron Techron fuel additive. Directions on label.

How's the oil level?

What oil viscosity are you using. It's coming on to summer over there now, (I assume you are in NA) so use a 15W-40, as long as the temps don't drop below +10F. Delo 400 would be the ideal oil for this, it is a diesel oil, but rated for petrol (sorry, gas) as well, and will clean all the crap out of the motor.

Change the oil and filter at 3,000 mile intervals.

Let us know how you get on. Try the Techron first, and do a couple of long fast trips now and again.


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Last edited by TopGhia; 03-30-2004 at 11:01.
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Old 04-07-2004, 19:16   #3 (permalink)
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Re: Rod Bearing or Carbon Knock - 1991 -302

lol using gas wont get rid of it~ if it has a carbon ping to it~ you have to R&R (remove and reinstall) the heads to move it out~ other then that i would recommend you Sea Foam your motor after you remove the carbon deposit.
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