About cams, valves and timing positions...... Help?

[Grizz1963]

Paul Y also came over early to supervise (well, he did all the work as he has built a few engines and knows his way around) he also tried along with Martin to teach me stuff, I think I make a good cuppa tea though.

No smiles today......



I took photos of stuff in position and also the progress, that is my job.



I did help find some nuts n bolts and made a few bits up.



Ohhhh, and another useful tool....... Keeps stuff in position. Simple.



Moving stuff about.



Very good news.... It's a four bolt main.

And the oil pump has been upgraded.





Then when the front end got opened.... Timing chain good.

But note the position of the timing marks......... Way out it seems.



With the camel hump heads off, it was found that most of the exhaust valves were missing their valve stem seals.



The engine has definitely been rebuilt previously, block has been decked, it has a +30 overbore with the cross hatching very visible, new brass freeze plugs, new oil plugs, oil pump, you get the picture.

In the truck the engine was running fine, and the reason for the tear down was that is was using a lot of oil and low compression on No 1 (both wet and dry). Think we have found the problem for the excessive oil use, lack of valve stem oil seals on exhausts, and a build up of carbon under the exhaust valve on No.1 giving a bad seal against valve seat. Upon disassembly the whole engine smelt of burnt oil and the heads and pistons had a heavy coating of oily carbon. Maybe because it has a broken valve spring, that valve has a mushroomed valve stem (and may possibly be bent)

The cam itself is undamaged, the lifters are good and the pushrods are straight.

So, the need to identify it is to ensure that the correct valve springs are procured and the mystery of the off timing marks can be solved.

What are the markings on the cam then ?

Glad you asked - This is what is cast into the cam

EP6
30
D8
C8
C5
CWC

There is also Blue and Purple paint on the distributor drive end of the cam and a 2 white spots half way down.

On the distributor end there is also an A punched into the shaft. Other than that there are no marking or casting number.

I 'think' that it is a Chevy cam rather than an after market item but happy to be proved wrong.

Spring has sprung.







So that then was the fun for today.

Seems the motor needs a few bits to get it back together.

A valve, springs, clean up and some info as tow hat motor this may be, so that I know what springs to buy.

Thanks as always to helping friends, Paul and Martin.

Back to normal tomorrow.