An eccentric question

DD (CA)

DD (CA)

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CAT Member
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We don't have mechanical fuel pump, right? But, the prior motor had an eccentric on the gear... so I have that part, which would entail installing it with a longer cam pin too. I told the engine guy to leave it off.

But, how did they come from the factory?

Eccentric installed anyway?

Any reason to have it?

Silly questions... but the motor is going back together.

PS: I stayed with blue per forums request, and it's an official Ford blue. It looks too light to me. Might change it. :p
PPS: Silly to port stock heads too. But did...

Thanks,

Derek
 
Last edited:
Little late now but, larger Chevy valves will fit in that head. My 260 heads were worn out and my machine guy installed new seats and larger Chevy valves.
 
DD (CA) said:
We don't have mechanical fuel pump, right? But, the prior motor had an eccentric on the gear... so I have that part, which would entail installing it with a longer cam pin too. I told the engine guy to leave it off.

But, how did they come from the factory?

Eccentric installed anyway?
Click to expand...

Onw was on my 260, also shown on in Fig.66 on page 42 of Section B of wiorkshop manual. No purpose on our motors that I have heard. Most people I have talked to seem to think it was just easier for Ford to assemble things the standard way.

Just be sure the bolt through the fat washer and lock washer against the timing gear does not bottom out. The thickness of the eccentric acts as a spacer of sorts, so without it the regular bolt goes deeper. I seem to remember having to using a different length bolt when I put in a double row timing chain back in the early days and had issues with the correct bolt length.

Gene
 
DD (CA) said:
We don't have mechanical fuel pump, right? But, the prior motor had an eccentric on the gear... so I have that part, which would entail installing it with a longer cam pin too. I told the engine guy to leave it off.

But, how did they come from the factory?

Eccentric installed anyway?

Any reason to have it?

Thanks,

Derek
Click to expand...

Derek,
My Mark II 289 had the fuel pump eccentric when I bought it from a previous owner in 1970. Also, Rootes' Parts List Supplement for the Sunbeam "260" and "289" (Publication No. 6601334) shows the eccentric for both engines.

If the eccentric is left off, a washer of equal thickness should be used in its place, so the timing gear bolt does not bottom out in the internal threads in the camshaft. If it does, the torque specs could be reached, but the bolt could back out with catastrophic results. Another option would be to use a shorter bolt. Or just leave the eccentric there. I am not sure what it hurts, other than just a very tiny bit more rotating mass.

David
 
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