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Discussion Forum
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2N piston valve movement

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Tom(TX)

08-25-2002 15:39:33




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I hope everyone had a good weekend...it got down to around 93 today..(usually 'round 100)...and that meant it was time to play with the N. Anyhow...here's my situation...few days ago I did a compression test on the engine and all were around 60#. I pulled the valve covers and lubricated the valves w/ MMO for a few days and the compression in #1 increased 15#. The others didn't increase any. I found a few small pieces of metal behind the valve covers so I then decided to pull the head ....this is where my limited knowledge ends and my questions begin....What do I need to look for in relation to the pistons movement w/ that of the valves? My #1 and #4 pistons move indepedently but #2 and #3 move together. Is that normal? The valves had a good bit of carbon build up...but none were stuck completly..they may not be going up as far as the should though...I'm not sure...Any advice will be throughly appreciated....

Tom

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ZANE

08-25-2002 19:15:39




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 Re: 2N piston valve movement in reply to Tom(TX), 08-25-2002 15:39:33  
The front and rear throws of the cranshaft are up at the same time and the two in the middle or up at the same time no way that they can be otherwise unless the crankshaft is broken.

If the valve don't come up far enough the only think out side of some radical valve to tappet clearance is that the cam lobes are worn down and not raising the valve tappets enough. Each valve tappet should move the same amount.

The small pieces of metal in the valve chambers may be parts of the springs, guides or the valve guide keepers or the valve stem keepers. If the valve stem keepers are off the valve stems this could explain the low compression readings.

Why did you take it apart???? Did it not run good? I have seen lots of these old engines that ran just fine with 60 PSI compression on all cylinders.

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Tom(TX)

08-25-2002 20:26:46




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 Re: Re: 2N piston valve movement in reply to ZANE, 08-25-2002 19:15:39  
Zane,
Thanks for the reply concerning the movement of the valves..helps me understand ALOT better!! As for the reason I pulled the head and all...I'm kinda young and the only information I know is what I gather from this forum..FNH..or the I&T..I bought the tractor as non-running so it was fairly cheap..and I figured I could work on it myself and learn as I went and wouldn't have to worry too much about messing something up...anyhow...after I inspect the valves..I'll put on new headgasket...and put'er the head back on... Thanks Zane

Tom

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