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Farmall & IHC Tractors Discussion Forum
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What is Knurling valve guides?

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biggerred

09-26-2005 15:16:50




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Been running Farmalls for years and have no idea what "Knurling the valve guides" means. I had some valve guides replaced once, along with the valves and that old M smoked when you first cranked her anyway. Maybe the head shop should have knurled the valve guides???




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Little Ed

09-26-2005 19:21:12




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 Re: What is Knurling valve guides? in reply to biggerred, 09-26-2005 15:16:50  
With the head off of the engine and the valve out, a tool that looks like a deep hole tap, but without the interruptions that would cut a chip, is lubricated and then run down the valve guide hole. The tool is spiraled like a bolt, but does not cut threads, instead it displaces the metal and thereby makes the diameter of the hole smaller. It is then reamed to the proper size according to the diameter of the valve stem + a clearance. The grooves that are left in the guide will actually hold more lubrication than a plain guide. I have pressed in new guides that already had been knurled from the factory, I assume (yes, I know the rule of assume) to provide an extra degree of lubrication.

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Kevin

09-26-2005 19:06:03




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 Re: What is Knurling valve guides? in reply to biggerred, 09-26-2005 15:16:50  
Finally, a question i can answer. Im a precision machinest in training. Knurling is done in different patterns, most common is the cross hatch like on many tool handles. The basic idea behind all knurling is expanding the diameter of the metal. When you knurl a piece it put presure on the metal pushing the metal outwards were the pattern isnt pushing in. Email me if you need a further explanation.

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Allan in NE

09-26-2005 18:40:20




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 Re: What is Knurling valve guides? in reply to biggerred, 09-26-2005 15:16:50  
Ya did right.

Replacing is much better than knurling because a knurled surface wears 70% faster because of the missing surface area.

Knurling is a stopgap repair at best; kinda like putting new rings against an old worn cylinder wall. (I've never understood the logic behind that one either).

Allan



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lee

09-26-2005 18:16:29




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 Re: What is Knurling valve guides? in reply to biggerred, 09-26-2005 15:16:50  
It's a quick fix and not a great one at that although it has worked in the past it's mostly and old timer fix but it will get it on e-bay or to auction.



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Shaggy

09-26-2005 21:56:04




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 Re: What is Knurling valve guides? in reply to lee, 09-26-2005 18:16:29  
Oldsmobile has had knurled guides from the factor for years and most of them lasted close to for ever. Plus the way I am looking at it is the tools were FREE and and the tractor is not going to be turning a lot of RPMS so what the Heck.



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buickanddeere

09-26-2005 17:13:01




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 Re: What is Knurling valve guides? in reply to biggerred, 09-26-2005 15:16:50  
It"s a cheap temporary patch job to reduce valve guide/valve stem clearance and wobble. New bronze inserts reamed to clearance for the valve stems is the only way to preserve vlave/seat life. Or new press in valve guides.And reduce oil consumption when done with new valve seals. If the valve stems are worn undersize then valve replacement is required. Sometimes valves with oversize stems that require reaming the worn guides oversize and true are an option.

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RN

09-26-2005 18:17:20




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 Re: What is Knurling valve guides? in reply to buickanddeere, 09-26-2005 17:13:01  
Knurl guide? Some engines with cast in guides-some Chevy- knurling is practical way to do lower cost valve grind job. Ford had oversize valve stems on replacement valves more available than GMs- $14.00 to $20.00 a valve compared to $3.00 a knurled guide was the advantage. Dodge hemis and VW beetle engines had easier to replace valve guides-Half knurling was only a oil control measure for valve job. Some Tecumseh engines didn't have replaceable valve guides like Briggs-knurling was the practical option. RN.

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Heat Houser

09-26-2005 15:51:23




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 Re: What is Knurling valve guides? in reply to biggerred, 09-26-2005 15:16:50  
Many tool handles are knurled such as (maybe) the handle of your 1/2 drive rachet wrench. Typically, this is a cross hatch pattern that is rolled into steel. This differs from cutting threads as this removes metal. The rolling method of knurling does not remove metal but rather "raises" bumps of it up. The rachet handle example is on the OD while knurling a valve guide is on the ID. Knurling a guide will reduce the effective diameter of the hole and the guide will have to be resized (drilled out) to allow the valve stem to fit. Better oil control...I don't know.

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Billde

09-26-2005 15:42:50




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 Re: What is Knurling valve guides? in reply to biggerred, 09-26-2005 15:16:50  
Valve guides are knurled [internal] in the head. A knurling tool is inserted into the guide bore and as it is rotated and advanced the tool displaces steel making the bore smaller. Then the bores a reamed [slightly oversize] to match the diameter of the valve stems.



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Dave_Id

09-26-2005 15:22:37




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 Re: What is Knurling valve guides? in reply to biggerred, 09-26-2005 15:16:50  
I'm guess here. It could mean to chuck up the guides in a lathe and slightly knurl the OD which when reinstalling would cause the guides to be tighter against the valve stems. ?????



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Janicholson

09-26-2005 18:15:05




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 Re: What is Knurling valve guides? in reply to Dave_Id, 09-26-2005 15:22:37  
The descriptions above are OK the process is (in my opinion of 40 years of Porfessional practice cretification, and training) very good, and not to be considered a patch. The operator must do the proper job, it requires measuring skills and selection of appropriate reamers for finishing. It is just fine, do it with pride!!! The seats should be finished after Knurling, not before.
JimN



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Chris in Washington

09-27-2005 00:52:15




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 Re: What is Knurling valve guides? in reply to Janicholson, 09-26-2005 18:15:05  
I agree with Janicholson. Knurling holds extra oil which increases lubrication and decreases wear over non-knurled guides. It is not to be considered a patch.



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