Question about 1990 Ford F250

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Hello...I have a 1990 Ford F-250 with 70,000 orginial miles...it has the 300 6 with a auto trans...it has a knock when I put it in gear...my mech said it was a bad wrist pin...come on...the 300 6 is one of the most dependable engines around...because it is a auto trans...does anyone think that a flexplate...tork convertor bolts...or something like that is the problem...??? I just find it hard to believe something is wrong with the engine...I have had several of these 300 6's and they were all good engines and ran forever...thanks...

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  • Gary Darby Mar 13, 2011

    Thanks for the help...a cracked flywheel sounds like it could be the problem...it only knocks when I put it in gear...I have never used sea foam but it sounds like a good product...keep up the good work and if you think of anything else...hit us up...later...good web site by the way...thanks guys!!!

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I would probaly agree, these are very reliable engines.Most of the time a bad wrist pin wull be noisy at load and higher rpms, not at idle in gear.Cracked flywheel is possible , loose converter bolts is unlikely since ford uses a crimped bolt.These engines sometimes will build up carbon on top of the piston and usually running a can of SEA FOAM through the intake will take care of it.The carbon can cause a slight knock and may sound like a wrist pin or rod bearing.Good luck!

Posted on Mar 13, 2011

  • Gary Darby Mar 13, 2011

    Thanks for the help...yes, it only does knock when I put it in gear so the flywheel problem sounds like what is wrong.,,,if you think of anything else...post it...

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