Rod Bearing or Carbon Knock - 1991 -302 - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 03-30-04, 09:17 AM Thread Starter
Registered User
Join Date: Mar 2004
Posts: 3
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
barns1 is offline  
Sponsored Links
post #2 of 3 (permalink) Old 03-30-04, 11:51 AM
Registered User
Join Date: Sep 2002
Location: 27 00S 153 07E
Posts: 1,944
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.


"I married Miss Right. I just didn't know her first name was Always."

Last edited by TopGhia; 03-30-04 at 12:01 PM.
TopGhia is offline  
post #3 of 3 (permalink) Old 04-07-04, 08:16 PM
351 H.O. representin Cali
Join Date: Apr 2004
Location: East Oakland, California U.S.A
Age: 37
Posts: 13
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.

351 windsor
Davincci 750 CFM carb.
offenhauser dual plane port lower intake manifold
Air Flow Research 185cc Aluminum heads
Harland Sharp 1.6 roller rocker
Crane Cams idle-5500 rpm range
Crane solid lifters
Custom fabricated cold air intake
Aeromotive fuel filter 100 micron
Hedman hedders
Perma Cool electric fan 14" 2950 CFM
B&M shift kit
c-4 transmission all kevlar
Taylor 40 race wires 11.4 mm
March pulley set-up
89droptopFOX is offline  
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Windsor Tech
Gear in this thread - Powered by O'Reilly Auto Parts

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
How old are you and how many vehicles have you owned? JG33PY The Pub 318 07-02-04 05:17 PM
My 302 Clevo is broke but still runs. HOW? uterozbert Cleveland Tech 6 03-24-04 01:58 PM
Brembo Brakes on Tickford and FPV Utes - The Saga Ends? Aussie Pete Suspension | Wheels&Tires | Brakes 34 01-19-04 06:52 PM
Experts knock premium gasoline.... Stacy94PGT Ford Worldwide News 0 04-03-03 08:59 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome