300 I-6
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300 I-6
Was told by mechanuc that the 300 6 has a fiber gear for the timing I was just wondering if this is true or not the engine quit running and spins fast now when starting any one know about the gear makeup thanks
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300 I-6
I do think that some models may have come with fiber gears,but, I also have NEVER,EVER heard that of any 300 stripping a cam gear!(unlike the 2.5 Pontiac!)You may have a couple things gonig on here. Onw might be you simply have no spark,which will make any engine spin faster.Second, you may have broke a dist. gear pin which has the same effect as no spark but worst because the dist. doesnt even spin & the oil pump doesn't pump either ! Take it one step at a time.
Phillip
Phillip
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Joined: Dec 1999
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From: Gustavus Township, Ohio
300 I-6
I just replaced a set in a 1986 f-150: the top gear (for the cam) is a fiber type gear; the other is made of metal. If you don't like the fiber gear ask to see a set for a early 70's 300, they're both made of metal. I was investigating the 10 degree timing retard on the newer (80's) models when I discovered this. Take your old set in with you and see how they match up (mounting and whatnot). I seem to think the older set had a couple of bolt holes where the newer set did not.
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Joined: Jul 1999
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300 I-6
Sounds to me like if its spinning faster than normal that maybe there is no compression ? I know its hard to beleive a head gasket could fail so bad that it allowed compression to escape from all the cylinders .I have never seen or heard tell of a cam gear stripping either .Even if the cam gear did strip , some of the valves are going to be closed and some open , but I dont think the ones open would allow enough compression to escape to make the engine spin faster than normal during starting ? Im pretty sure this is a contact/ interference engine too ? One way to be sure is to pull the distributor cap off and have someone crank the engine .
Paul
Paul
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Joined: Jan 2000
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From: Metro Detroit (Redford)
300 I-6
Why would anyone put a fiber gear for the timing? Is it to save money? Is it for noise reduction? It makes no sense, and would create a weak link in an otherwise bullet-proof engine. Anyone know how to determine if a particular 300 six has a fiber gear without taking off the cover? Were there certain years for this?
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Post Fiend
Joined: Jan 2000
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From: Metro Detroit (Redford)
300 I-6
I called a Ford dealer parts dept and asked what the OE gears are for my '95 300 six. They looked it up and said it is listed as a plenomic (spelling?) tooth gear set (about $93). They told me that plenomic means it is a hard plastic and that is for both gears. I asked if that was only the replacement and that the original may have been metal and was told that this set has an older number and so probably was OE. And here I thought this was sucvh a great engine with its gear driven cam, vs a chain drive (or worse yet the rubber band on many OHC engines). Oh well, my '84 300 six has 176000 miles on it. If it has the plastic gear (and it sounds like it does) then it must hold up OK.
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300 I-6
The 300's from the '80's I've worked on had the fiber cam gear. I Had one get stripped on a reman engine after about 10K miles. I could find no problem. I checked all the lifters. All I could think was one froze for some reason-one pushrod was a little bent. I think the fiber gear may eliminate some noise but also cut down on wear to the crank gear as well as protect other parts if something does go wrong as in my case. Just my 2 cents
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