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I have a 70' F250 that's been having a timing problem since I bought it. I finally got around to working on it and found that the cam timing gear had skipped and was about 180 degrees from where it should have been. still had the old nylon toothed gear so i decided to upgrade to an edelbrock double roller timing set. got the gears swiched over and noticed that the gears were out of alignment. the crankshaft gear is about .047" forward of the cam gear. Im wondering if there was supposed to be a spacer or something to move the cam gear forward to align. I put the old gears back on to check and they were also misaligned. This is my first time tearing into an engine so any tips or info you guys can give me would be greatly apreciated
There was no spacer to begin with and my replacement double roller apparently doesn't have the spacer built in because they do not align. The cam gear sits closer to the engine block than the crank gear does. there is a .047" difference. So do i just need to track down a new spacer or did i get the wrong part?
There was no spacer to begin with (it HAD to be there with nylon gear) and my replacement double roller apparently doesn't have the spacer built in because they do not align. The cam gear sits closer to the engine block than the crank gear does. there is a .047" difference. So do i just need to track down a new spacer or did i get the wrong part?
The factory installed nylon gear required the spacer (C3AZ-6365-A), see parts catalog pic.
The "service part replacement" aluminum gear: C8AZ-6256-A has the spacer made as part of it.
Notice what the parts catalog sez inre C8AZ-6256-A = 6265 spacer NOT USED.
I put the old gears back on to check and they were also misaligned.
If the old gears now are mis-aligned then the new ones are prolly OK. I have two scenarios.
1. There was a spacer there and snuck off without you seeing it when you took the old cam gear off. The little bugger might have fallen down in to the oil pan. Drain the oil and try fishing it out with one of those extend magnets.
2. You gave the new cam gear and cam a few "love taps" a bit to hard and moved the cam in farther than it was.
I forgot to mention that this isn't the original engine. It had a 360 which got replaced with a re-manufactured 390 back in 85'. The original owner only put about 20000 miles on this engine before parking it due to some timing issue.
My suggestion would be to get the spacer and try it. The roller chain probably requires a good alignment. If the chain doesn't hit the cover you're fine.
This is what I am thinking. How much can you pull
the shaft in and out? When you push the new gear
on to the cam I think it moved back a bit. So when
the engine starts the first time now with the new
gear set it will pull itself back into line. I hope this
makes sense to you. Having some play in and out
is not uncommon. And the gears will center again
on the first start. They always have for me.
There is very little end play. not enough to make up for the gear alignment. I decided to get a shim for the cam gear. Going to pick it up today. Now i need to realign the cam gear. what is the best way to do that with out damaging anything? It is too stiff to turn by hand
I see on rockauto that there's a timing cover gasket set with and without a sleeve. Price diff is like $5. What is the sleeve for and how do I know which kit to get?
As for the sprockets, rockauto shows a lot of them. They range in price from $15 to $24 and then jump up to $72 (whch looks like the price where the double rollers begin). Which do you guys get?
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(it HAD to be there with nylon gear) and my replacement double roller apparently doesn't have the spacer built in because they do not align. The cam gear sits closer to the engine block than the crank gear does. there is a .047" difference. So do i just need to track down a new spacer or did i get the wrong part?
