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-   -   Camshaft - continuation from the List (http://www.risingsun4x4club.org/forum2/showthread.php?t=8496)

PabloCruise 11-14-2008 12:53 AM

Camshaft - continuation from the List
 
2 Attachment(s)
From when the forum was down...

We were talking about camshafts and then followers, and then if the lifters should rotate.

Mine looked like this when I pulled the cam to fix my oil squirter leak...

Do you think someone forgot to regrind them when rebuilding the engine?

SROR/AKA 2BAD 11-14-2008 07:43 PM

they sure don't look like they rotate do they?
what does the cam look like? :eek:

PabloCruise 11-15-2008 02:02 PM

No, I don't think they are rotating...

Not sure if I got a pic of the cam. It looked acceptable when I was in there.

Rzeppa 11-22-2008 10:25 PM

WOW!

Clearly that lifter (er...follower?) has not been rotating. I would take an educated guess that it wasn't so much that it had not been ground, as it had not been ground with that slight arc, or possibly that there may have been some reason it wasn't being allowed to rotate in the block.

Rogue Leader 11-25-2008 03:59 PM

On the topic of cam shafts and followers, does anybody know of a shop in CO that will regrind both? I called my machine shop and several others around town and the consensus was that there were no places in Denver anymore.

Uncle Ben 11-25-2008 04:55 PM

Quote:

Originally Posted by Rogue Leader (Post 90362)
On the topic of cam shafts and followers, does anybody know of a shop in CO that will regrind both? I called my machine shop and several others around town and the consensus was that there were no places in Denver anymore.

Way back when I built the F in Wildrice I had Spitfire make the cam. It still is a bad mutha of an F so they must have done it right. Mac, the original owner couldn't still be alive as he was old back then but the shop is still around and still cranks out some nasty stuff so you might give 'em a call....

http://www.spitfireracingengines.com/services.html

leiniesred 11-25-2008 06:13 PM

That is what the tappets always look like when the cam goes flat. *shrugs*

I have a hunch that modern engine oil is to blame for your flat cam.

In Austin Healey land, we've discovered cam destruction is often related to today's oils vs yesteryear's flat tappet technology. A brand new cam, with propper assembly lube and break-in, can go flat in < 1,000 miles on a healey! The big healys sport a big ol' cast iron I-6 tractor engine very similar to the FJ40's engine.
Today's oils often have less of some critical additives. (Zinc Dialkyl DithioPhosphate in particular (ZDDP))
Here is a great link:
http://www.netbug.net/blogmichael/?p=49

PabloCruise 11-27-2008 07:56 AM

Quote:

Originally Posted by Uncle Ben (Post 90368)
Way back when I built the F in Wildrice I had Spitfire make the cam. It still is a bad mutha of an F so they must have done it right. Mac, the original owner couldn't still be alive as he was old back then but the shop is still around and still cranks out some nasty stuff so you might give 'em a call....

http://www.spitfireracingengines.com/services.html

Good to know Kev, thanks!

PabloCruise 11-27-2008 07:59 AM

Quote:

Originally Posted by leiniesred (Post 90374)
That is what the tappets always look like when the cam goes flat. *shrugs*

I have a hunch that modern engine oil is to blame for your flat cam.

In Austin Healey land, we've discovered cam destruction is often related to today's oils vs yesteryear's flat tappet technology. A brand new cam, with propper assembly lube and break-in, can go flat in < 1,000 miles on a healey! The big healys sport a big ol' cast iron I-6 tractor engine very similar to the FJ40's engine.
Today's oils often have less of some critical additives. (Zinc Dialkyl DithioPhosphate in particular (ZDDP))
Here is a great link:
http://www.netbug.net/blogmichael/?p=49

Wow, this looks like a great read. I'm going to have to get another cup of coffee... Sure hope my cam is not flat. I should be able to measure lift at the rockers, eh?


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