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Timing chain & Cylinder head assembly

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Posted 08-06-2010 at 10:37 PM by redfalken
Updated 08-06-2010 at 10:39 PM by redfalken

Still making progress on the engine build! Some parts have arrived including a new dual roller timing chain and gear seat (see photo) from Classic Inlines http://www.classicinlines.com. The old chain had over 1/2" of deflection which is where you should consider changing it. This new chain is much more sturdy than the stock chain so it should last quite awhile!

I also installed some teflon valve seals. The photo below shows the new seal on the right and the stock umbrella seal on the left. The teflon rides against the valve stem and hardly wears, unlike the rubber on the stock seal. The umbrella seals also tend to get brittle and can break off and block oil passages. I picked several pieces out of the oil galley by the lifters. The machinist had to turn a little material off the boss for the valve stem and these slip over with a spring clip to hold them secure.

I installed new springs and keepers and the valves are all in place. I also decided to paint Glyptal in the valley of the cylinder head to help oil flow down to the pan more quickly. Glyptal is a very sturdy paint originally used on electric motors. It withstands heat and also helps to trap any metal bits leftover from machining.

One other thing I did to help oil flow was grind away a bit of the shank of the bolt that holds down the rear post of the rocker arm assembly. Oil flows up from the block, through a passage in the cylinder head, and around this bolt to fill the rocker assembly shaft. Later model engines had the shoulder further up from the factory but you can just grind and file up about 1/4" on a standard bolt and get the same results.
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