[PhiberOptik]

I recently installed a new comp cam and after running for under 100kms am tearing apart the bottom end, and when removing the crank I noticed a lot of shaving inside the cam eccentric that runs the fuel pump from the front cover

I guess the spacing isn't right, but the eccentric isn't new and was on with the old cam that didn't cause this problem

has anyone run into this before?

thanks, Jon

 

[pedal2themetal45]

HI
You might have some cam walk going on... is the cam shimed in right? how much play is there in the cam (front to back). maybe pull the eccentric and see what the block looks like...
tim

 

[PhiberOptik]

yes the cam moves front to back about 3/16" when the thrust plate is installed, where are the shims installed?

 

[ckelly]

That's too much. Should be in the .010 end play area. Never used shims on a Ford cam - the gear and the retainer set the clearance. Sounds like something's shewed up in that area.

 

[PhiberOptik]

this is the cam shaft

http://www.compcams.com/Technical/Search/CamDetails.asp?PartNumber=35-238-3

and it's in a 69 351w with a ford aluminum front cover

 

[dennis112]

Are you using a billet timing gear? If so, you also need to use a steel retainer. The stock cast one will get chewed up over time.

 

[PhiberOptik]

no it's a cast clevite double roller timing set.

i'm pretty sure it a problem with the dowel pin

 

[PhiberOptik]

I just snapped some pics

 

[gregaust]

Ouch that's nasty,you need to find where all the endfloat is coming from and correct it first then fit the cover and look through the fuel pump hole and check the clearance.

 

[PhiberOptik]

well with the eccentric off i can grab the snout of the crank and move it 3/16 to 1/4" back and then pull it forward to the plate

i assume this isn't normal?

 

[FEandGoingBroke]

You mean the snout of the <U>cam</U> right?

 

[FEandGoingBroke]

You're saying the cam moves in and out 3/16" to 1/4"? Wow!

I can't see it moving that much. But, the plate should keep it from coming out far enough to hit the cover unless it's a bunch of non FOrd parts and you need a diffrent eccentric or maybe a diffrent timing cover...

FE

 

[FEandGoingBroke]

Or shave the eccentric down a little bit with a grinder or a belt sander....

 

[PhiberOptik]

yea sorry i mean cam

and i think it is just a problem with too long of a dowel pin in the cam to locate the eccentric, the washer is bent pretty good, and the plate holds the cam in from going far and when the eccentric is bolted in the cam can't go anywhere.

<font size=-1>[ This Message was edited by: PhiberOptik on 2/25/06 11:41am ]</font>

 

[slow-poke]

I think you are correct about the cam pin being too long. I had to shorten (grind down) a long pin during my last engine build.

I had two pins one was too short, and the other was too long.

 

[107485]

dumb question which way does it spin in the pic^ clockwise or counter? just wondering if they can come loose.

 

[PhiberOptik]

motor spins ccw, so no it can't come loose

 

[mikemustang289]

What timing cover are you running? early model with mechanical pump or latemodel?

Are you sure that you have the right timing chain. You cant use a latemodel chain with an early timing cover, you'll have clearanc issues between the eccentric and timing cover similar to what you have going on there.

 

[PhiberOptik]

well unless the chumps at lordco gave me the wrong ones it should be right i told them it's a 69 351w

 

[mikemustang289]

do you have your old one? compare the thicknesses of the gears.