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Farmall & IHC Tractors Discussion Forum
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To lap or not to lap...

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Slappy

04-04-2005 11:45:23




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The rebuild on my H is progressing and I'm about ready to start putting things back together - a welcome change from tearing them apart! The head is back from the shop with new valves and seats and therein is the question. I have read several sources on rebuilding tractors most say to get a valve job or if the valves are in good shape lap them. One, however, states that you should lap the valves even if a valve job was done. How about it, good idea or waste of time?

Thanks in advance.

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little trick for you

04-04-2005 20:15:53




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 Re: To lap or not to lap... in reply to Slappy, 04-04-2005 11:45:23  
Heres a little trick for you. If you intend to sell a tractor or truck, and it has a little miss you think is coming from a valve, fill the cyl with air, take the spring off and chuck your drill on it. just give it a good spin pulling lightly against the seat. Alot of itmes this will seal it and you can send it down the road for alot more.



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Aces

04-04-2005 19:58:26




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 Re: To lap or not to lap... in reply to Slappy, 04-04-2005 11:45:23  
If the seats and valves are ground right should not need to be lapped.



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riverbend

04-04-2005 17:14:04




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 Re: To lap or not to lap... in reply to Slappy, 04-04-2005 11:45:23  
I'd check with the shop.

I had purchased a 'remanufactured' head that had all the valve seats installed a little too deep on one side. Instead of sending the head back to have them try again, I took it over to the local Harley shop (Donahues) and had their machinist fix it. When I got it back he said the valves did not need to be lapped, it was ready to go.



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Redmud

04-04-2005 14:04:20




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 Re: To lap or not to lap... in reply to Slappy, 04-04-2005 11:45:23  
Call the shop and ask if they did it. Then lap if your in doubt.



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RustyFarmall

04-04-2005 13:42:31




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 Re: To lap or not to lap... in reply to Slappy, 04-04-2005 11:45:23  
Is the head completely assembled with valves installed? If so, don't mess with it. The machine shop already did everything necessary.



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Dave_Id

04-04-2005 11:52:05




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 Re: To lap or not to lap... in reply to Slappy, 04-04-2005 11:45:23  
Absolutely, lap them. It only takes a couple of minutes



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Mike co

04-04-2005 16:25:26




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 Re: To lap or not to lap... in reply to Dave_Id, 04-04-2005 11:52:05  
Ok guys , What are you talking about ? what is lapping



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Yugrotcart

04-04-2005 16:56:20




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 Re: To lap or not to lap... in reply to Mike co, 04-04-2005 16:25:26  
Lapping is when you apply a grease that contains an abrasive to the valves and the valve seat. The valves are rotated on the seats in orders to get the two surfaces to"seat" together perfectly to create a seal.



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korn_fed

04-04-2005 20:51:55




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 Re: To lap or not to lap... in reply to Yugrotcart, 04-04-2005 16:56:20  
couldn't you check that seal by propping the head and pouring a light oil or gasoline in the runner and seeing if the valve and seat seal?



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