Possible broken timing gears
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Elder User
Joined: Sep 2003
Posts: 926
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From: SE, Michigan
Possible broken timing gears
A friend of mine has a 92 F150, with the 300 that wouldn't start yesterday. It was a very cold night. Zero degrees with a -22 wind chill. After a bit of trouble shooting the rotor in the distributor was not turning while cranking the engine over. I next looked down the oil filler port and the rocker arms where not moving while turning the engine over. I know ford went to the phenolic gears for the cam not sure about the crank though. I believe that has failed, but I haven't open the engine up yet. Is the 300 a non interference engine between the valve and pistons? I'm just hoping a piston didn't hit a valve. The plan is to replace the timing gears with all steel ones from comp cams. Any harm doing that on a EFI engine? Thanks, Fred.
Senior User
Joined: Dec 2006
Posts: 164
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From: Gray, TN
I just rebuilt the 300 in my '90 F150 It had steel cam and crank gears in it when I took it apart. They didn't make any noise at all. They also didn't show any wear on their teeth. (I rebuilt because the cam bearings were worn out and I drove it for 6 months with no oil pressure) The rebuild kit also came with steel gears. There's no way I would put fiber ones in there when the steel ones work just fine without the risk of failure. I know a friend of mine replaced some broken phenolic gears in a late '80s 300 and the engine was ok.
Last edited by MintFord; Dec 23, 2008 at 06:28 PM. Reason: typo
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