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Harry Ferguson Tractors Discussion Forum
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TO20 valve tappet cold setting

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swh1965

08-20-2005 04:31:54




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Could someone tell me what the valve tappet setting(cold) should be on the intake and exhaust?




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Little Dave

08-20-2005 15:42:09




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 Re: TO20 valve tappet cold setting in reply to swh1965, 08-20-2005 04:31:54  
Err ..... John the valves and the seats wear faster because all the other parts are running in oil. I had to replace valves and seats in my head because they were worn so bad the adjustment screws were almost backed out of the holes because of the valve stems coming up farther as the seat and valve wears . I have had this TO-30 completly apart and every thing is new in the block and head and replaced every seal and gasket and worn part in the tractor. If I could not find a part for it I made it. I have been a machinst almost 50 years and have CNC controled machines in my shop here. Besides that I gave the book spec. on the clearance..... .

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John (UK)

08-21-2005 07:45:54




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 Re: TO20 valve tappet cold setting in reply to Little Dave, 08-20-2005 15:42:09  
I assure you Dave that the gap does open because wear takes place, why would we have rattling tappets after the engine has run a while if this didn't happen, if as you say it doesn't happen then like that we would never get rattling tappets as the valve clearance would close up. You get more instances of slack tappets than tight ones.I worked on these engines for years as a field service engineer and never did I see that like you say. But like all things it doesn't mean that it can't happen as we very well know literally anything can happen and very often does. If as you say your valve seats were worn to such an extent then the clearance would close but this is not normally the case. Valves and seats are quite hard, much harder than the other parts in the valve train, they have to be to withstand the heat, so for them to wear as you say is not the norm.

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swh1965

08-20-2005 15:17:08




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 Re: TO20 valve tappet cold setting in reply to swh1965, 08-20-2005 04:31:54  
Thanks guys



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Little Dave

08-20-2005 13:40:30




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 Re: TO20 valve tappet cold setting in reply to swh1965, 08-20-2005 04:31:54  
BEWARE.....As the engine valves, seats, push rods, tappets, and camshaft wears the gap closes and sooner or later the valve is not closing completly and will burn the valve and /or seat. So it is important to check valve clearance often. It is better for it to be too much gap as too close for that reason. I can hear every tappit in my engine and that is why they are called tappits. Dave



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gerard

08-23-2005 16:17:11




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 Re: TO20 valve tappet cold setting in reply to Little Dave, 08-20-2005 13:40:30  
Sorry to get technical, but the tappet is the mushroom shaped thing (commonly known as cam follower) that runs on the camshaft. Any "tappet" noise is usually from the rocker arm / valve stem (unless its OHC, which these engines aren"t).
Excessive clearance is as bad as too little. Instead of risking burnt valves, one is putting extra stress on the valve gear and cam follower, as the latter is now contacting the cam part way up its ramp, where acceleration of valve train is increasing. Result could be failed cam follower or premature wear of camshaft.

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John (UK)

08-20-2005 14:52:47




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 Re: TO20 valve tappet cold setting in reply to Little Dave, 08-20-2005 13:40:30  
Err Dave....I think you got that wrong way round....as it wears the gap opens.



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John (UK)

08-20-2005 08:38:58




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 Re: TO20 valve tappet cold setting in reply to swh1965, 08-20-2005 04:31:54  
Both when cold .012" but you will need to set them when warm anyway as they will bed in a little so set them to .014" when warm.



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Little Dave

08-20-2005 08:37:34




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 Re: TO20 valve tappet cold setting in reply to swh1965, 08-20-2005 04:31:54  
The setting for the valves are .013" hot , .015" cold on both intake and exhaust for the Z-120 and Z-129 engines. Dave



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