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d343(1693) cylinder head

d343(1693) cylinder head

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Westgate
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Looking for cylinder head for a d343 other known as 1693. going in our 988 (A). Overhauling engine will be needing cylinder packs, head gasket etc but those look to be more readily available. Radiator will also need to be rebuilt or replaced I'm told Maine radiator can rebuild but have yet to call. Also years ago tried to replace the oil cooler through Cat and got the wrong one. Plugged the bottom tubes that were worn through to work the following day and it's been that way since. Will be needing to replace that also. Engine came out of a 769 Haul truck, back in the eighties. Located in Massachusetts. Thanks for reading. Any pertinent information is welcome, I would like to learn more about the machine. I am third generation running this machine.

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Fri, Feb 20, 2026 10:15 PM
d9gdon
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www.offroadeq.com has several new aftermarket heads in stock across the country.

I have used them several times for new old stock and aftermarket parts. Very good to deal with.

4N6765 is the part number.

Your local Cat dealer still has them but they're $12,500.

Here's a used one for sale:

https://www.machinerytrader.com/listing/dismantled-machines/191480049/1965-caterpillar-631b-motor-scrapers

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Sun, Feb 22, 2026 3:49 PM
Old Magnet
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Here's the casting numbers for the heads, 5M3600, 8M100 and 9S3. Also listed on Machinerytrader.com

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Sun, Feb 22, 2026 3:58 PM
bluox
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Where are you located?

Customer cutting a 988 up this week.

Bob

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Mon, Feb 23, 2026 4:27 PM
Westgate
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Located in South eastern Massachusetts off-road eq had the head in stock best price around brand new! Great to deal with also. Thanks

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Sun, Mar 8, 2026 8:51 PM
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