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Installing hardened valve seats

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Keewaydin

10-04-2000 14:29:27




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We seem to be having more trouble with exhaust valve wear in our 3 8Ns and 2 International 424s.
Some say that the no-lead gas is hard on these old engines. We add a quarter cup Marvel Mystery Oil per gallon gas and it may help a little but doesn't seem to be the real answer. Anyone had experience with having hardened valve seats installed? Sounds like it would run into money and I'd want to know how well it worked before going that route. Thx.

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albe

10-05-2000 08:15:02




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 Re: Installing hardened valve seats in reply to Keewaydin, 10-04-2000 14:29:27  
The use on unleaded fuel will cause exhast valve seat recession when running high engine loading such as farm use in older engine with soft valve seats. Hard valve seat inserts is the way to go.



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Burrhead

10-04-2000 16:06:37




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 Re: Installing hardened valve seats in reply to Keewaydin, 10-04-2000 14:29:27  
I have the hardened seats installed on everything I rebuild here. It works real well. If you are already having to rebuild the valves it is'nt that much difference in the cost, but I would'nt do the valves just to up date them.

I've got a 7.3 Ford p/u that has over 150,000 on the hardened valve job and still going strong. The original valve & seats lasted til 103,000 miles and unseated, which ruined the head and piston.

I rebuilt 2 Perkins diesels here 4 or 5 years ago with the new seats and so far so good. The no sulphur fuels had ruined both valve trains.

The older gas and diesel engines both do better about not burning the valves when you put in the new ones, they just don't get any valve lube from the newer fuels.

Another thing that will cause the N tractors to burn the exh valves is running with the timing too high.

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Robert Boes

10-05-2000 19:39:19




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 Re: Re: Installing hardened valve seats in reply to Burrhead, 10-04-2000 16:06:37  
These guys are right on track. Put the seat in them when you can. To get you by, as you will most likely not be able to do all of them at the same time, there are some lead substitutes on the market. They will help, but are not a cure. As far as marvel mystery oil, I have a hard time believing it would help much? p.s. I just put a new head on my '49 Case VAC and I'm sure it will be fine. I also run hardened seats on my race motor and that runs near 7000 rpm with double springs with a dampner. A lot of seat pressure. good luck.

Rob

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