My rebuilt 300 only has 900 miles on it and the Nylon timing gear has lost a bunch of teeth. I just got the cover off today, so I am not sure what actually caused this to happen.

I have been reading these posts for a while now, so I know these composite timing gears are crap. Steel will go back on.

The new steel gear on the crankshaft does not have puller holes and the composite cam gear doesn't have good holes to get my puller into.

I have read some interesting stories about guys chiseling and sawing the composite gears to pieces to get them off. I understand aluminimum expands quite rapidly. Has anyone got the composite gear off just by applying heat?

I would be interested in hearing, if anyone else has suffered really premature failure with the composite gears. And secondly any new, good techniques for removing this junk.

I am definately going to buy top of the line replacment parts.

 

the nylon gears will do that if you have a high volume or high pressure oil pump, or a cam other than stock, or high perf valve springs.

Heck, nylon gears just do that.

 

thanks for the reply old halftons,

As far as I know my engine uses all stock replacement parts.

I only have about an hour or two every other day to work on this project. The next thing I am going to do is pull the oil pan to clean the nylon bits out. While the oil pan is off, I am going to give the oil pump a very thorough inspection to see if it yeilds any clues as to what caused this failure.

I hope it is - a case of defective crappy nylon timing gear! But I will have to make sure it is not the result of something else binding.

I am still looking for any good advice to get the gears off. The pullers I have don't fit. Maybe I need to buy a more expensive/specialized set of pullers.

 

replace oil pump and pickup screen when you have it apart. do not use hi flow pump.

 

I am in the same boat as ICEWAGON. I am changing the timing gears in my 89 f-150 with the 300. I have everything apart. I rented a puller from Autozone to pull the big fiber gear. I have adjusted that puller every which way and I cannot get that gear off. The jaws keep pulling out. The big fiber gear has the 2 holes in it for pulling. Is there a specific puller for those gears, one that is different that a universal. I do not want to just rip that SOB off of there cause I am not sure how I would get the metal center ring off. Please help, before I dump this truck in the Mississippi river (just kidding)!

 

1994 F-150 300-6

I was reading and got to thinking about preventive maintenance. So I ask, roughly how long do these composite gears last in a completely stock motor like mine? I'm coming up on 130k and wondering if I should just order the Coyles ones and get it over with.

 

I had 127,000 miles on a 1986 4.9 /300, the gears broke many teeth and engine shut down.


I also had bearings and crank wear do to a overheating problem, but Mobil 1 syn oil saved the engine,

I elected for a long block, so I didn't take the gears off as you need to, sorry if I didn't help.

 

Those gears don't fit that tight I believe if my memory serves me I have
got them off with a rolling head bar. I know they have another name for
them, and if that doesn't work get a medium sized bearing splitter.

 

I would try a bearing puller to get off. I have steel gears in my truck and they are way loader than the stock ones, so if you are worried bout noise you should probobly stick to the nylon ones

 

240,000 miles on original gears, never been apart.

 

I'm still on the original gears and I'll probably roll across 300k miles this weekend.

 

I put many 300's together with Fords steel set and I never had a noise problem.
Both pitches of gear the fine first until Ford quit supplying it and then the course.
As a matter of fact I put a used fine gear set up in a friend engine nearly 20 years ago
and it is still running. I have said it before and I'll say it again it is a great engine.
I also heard one where someone tried to mate the steel crank gear from the fiber set
with a steel cam gear. Try that combo and you don't have to worry about falling asleep
driving, you don't even want to get near it running.

 

Exactly what kind of noise is it? And it is a good noise or bad. Kotzy seems to think it's not something you'd want to be listening to.....

I guess BOTH of them should NOT be changed to steel...

 

No I don't think you read me quite right, a set of matched steel gears and I only
used Ford's, I wish I had the part # will not be noisey. It is when a person tries to save
money and buys only a steel cam gear to go with the steel crank gear from the nylon set that the problem is there.

 

Ask for a set of gears for a P500 or 600, see it Ford still supplies them.