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Valve seats on a Detroit 53 series

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Kirk_t

07-05-2005 12:17:17

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Hello All.
I'm working on a 453 Detroit Diesel with 4 valve heads. The engine drank water for better than 10 years so the head needs major work. (BTW, The block is being swapped.)

I've cleaned out the exhaust ports and did a mild porting job on them to smooth out the rust pits and casting imperfections. I'm also going to replace the valves and seats.

What is the best way to remove the seats from the block? I was considering MIG welding a bead around each seat to shrink them. Is there a better way?

Is there a good way to install the seats without the proper DD tool? I've heard about heating the block and freezing the seats but I'd prefer confirmation before I screw up the head.

After the seats are installed will I need to have them ground to spec or will hand lapping be sufficient?

Thank for any info.

Kirk

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Dennis Andres

07-06-2005 18:11:04

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Re: Valve seats on a Detroit 53 series in reply to Kirk_t, 07-05-2005 12:17:17

The seats come out without heating. I had a tool made that looked like chisel with a 90 degree bend in it. There is a small lip under the seat and you drive the tool under it. The seat just pops out. You need a tool to install the new seat,but it just drives in. You will have to have a professional to grind your seat and while your at it put new guides if they are below spec.Hope this helps.

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NC Wayne

07-05-2005 16:29:38

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Re: Valve seats on a Detroit 53 series in reply to Kirk_t, 07-05-2005 12:17:17

I work on equipment for a living and have rebuilt quite a few of the old two stroke Detroits over the past few years. Even so when it comes to the block and head work I leave that to the "professionals". Basically it takes too much special equipment to do it yourself, if you don't do it all the time, and even with the equipment it's too easy to screw something up if you don't have the knowledge to do it right. It may cost a little more to get a reman or to the existing head professionally done but in the long run you know it's right and you not gonna have to pay to do the job twice along with getting a professional to redo something that got screwed up. Just my .02

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Bob

07-05-2005 12:26:21

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Re: Valve seats on a Detroit 53 series in reply to Kirk_t, 07-05-2005 12:17:17

I've ground lots of valves over the years, and even installed some seats, but I would not consider tackling this job, if I were not familiar with it and had the correct tools and knowledge.

After the seats are installed, they will need to be ground concentric to the guides, anyway, and the $$$ on top of that to have a machine shop familiar with those heads install the seats will be money well spent.

There are too maney $$$ at stake if a seat breaks or comes loose, as there is no extra room for anything to be out of place over the piston of a diesel engine.

My suggestion for this one... let a "pro" do it!

While you're at it, check out the price of a re-con head. Some are very reasonable, and you would have a good warrantee to go with it, should something go wrong!

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