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Rusty head

P

PretendFarmer

Well-known Member
What can I do about this? #1 has rust on it, and the exhaust valve wont shut.
13618.jpg
 
Take it apart.Clean with a wire brush.Lap/grind the
valves/seats.Reassemble.Best OH the whole engine.By
the looks of that head,the rest of the engine needs
service,too.
 
I haven't done valve work before. How do I lap and grind a valve?
I am taking the engine apart, that topic is under "stuck 140 update"
 
(quoted from post at 17:38:39 01/08/13) I haven't done valve work before. How do I lap and grind a valve?
I am taking the engine apart, that topic is under "stuck 140 update"
Click to expand...

Take that head to an automotive machine shop and tell them to fix it. They already have all the equipment, tools, and know-how to do it right. It will cost you a WHOLE bunch less than buying the equipment needed to do it yourself.
 
(quoted from post at 09:38:39 01/08/13) I haven't done valve work before. How do I lap and grind a valve?
I am taking the engine apart, that topic is under "stuck 140 update"
Click to expand...

You take it to a good machine shop. Have it tested for cracks and they flatten the matting surface. The crack testing process usually involves cleaning up the head. They will also do all the valve work for you. If you go with the deluxe do everything package it will be around $200 if you don't need to put valves or seats in it.
 
Yes you can take it to a machine shop but if you do you best hold tight to your wallet because they will pull on it very hard. Last head we had worked on cost well over $500. My self I would do the job my self but I have done more then one over the years. You need a valve spring compressor to make it easy but you also need to free up that valve of you will have a lot of other problems. Done a good number of them that looked like that to start with but did not look to bad when done
 
the head work is machine shop specialized work. there is no way the everyday person can rebuild a head at home. you need a dunk tank,press, milling machine,valve and seat grinder, micrometers and know how to read and use them. as far as valve lapping , thats extinct like the dinosaurs. there is an interferance angle that takes the place of that, meaning the seat is ground to 45 degrees and the valve to 44 degrees.
no dought its going to cost 400-600 dollars but thats the price of things today... and you have a professional job not a back ally fix. also anyone not experienced in head work will not have a clue where to start even if they were put in a machine shop and said "go to it".
 
Just got off the phone with a good machine shop around here. $250 to re-do the whole head. If he needs to replace things, then it goes up. I will be dropping it off to him.
 
(quoted from post at 10:29:00 01/08/13) the head work is machine shop specialized work. there is no way the everyday person can rebuild a head at home. you need a dunk tank,press, milling machine,valve and seat grinder, micrometers and know how to read and use them. as far as valve lapping , thats extinct like the dinosaurs. there is an interferance angle that takes the place of that, meaning the seat is ground to 45 degrees and the valve to 44 degrees.
no dought its going to cost 400-600 dollars but thats the price of things today... and you have a professional job not a back ally fix. also anyone not experienced in head work will not have a clue where to start even if they were put in a machine shop and said "go to it".
Click to expand...

:D
 
ya thats a pretty much starting price. from the head pic's you have it appears like it will need seats and some valves possibly guides also. the valves look pretty recessed.let us know on the end product.
 
(quoted from post at 10:55:55 01/08/13) ya thats a pretty much starting price. from the head pic's you have it appears like it will need seats and some valves possibly guides also. the valves look pretty recessed.let us know on the end product.
Click to expand...

Mine have never been that bad. My WD-9 was the worst at around $400. That needed all new guides and exhaust seats. The MD head was around $200. I have a feeling I have a very reasonable shop doing the work. The owner is a member of the local tractor club and restores tractors.
 
Check out some videos on valve lapping on youtube. Look up "shopdogsam" as he's got a couple of very enlightening videos on cutting valve seats and lapping valves.
 
Do it right and do it only once. That means taking it to a machine shop. Had an H head done last summer with two bad valves and two seats replaced, it was 200 and some dollars, Money well spent. Joe
 
Pull the crankshaft and have it checked for wear.
May only need polishing. Buy your bearings from the auto machine shop. Hal
 
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