d4 valves and seats....

Mickey what serial number D4. Only later models had replacement valve seats, the earlier models have had to have the seats manufactured and the head reworked.

In a later D4 6U book the valves are listed as 4F212 for the Ex. & 6H3026 for the inlet but there is no seats listed in the book I have.We used to put 100s of them in at the dealer but can,t remember if there was a special parts book just for seats or where we got them for sure.A good automotive supply dealer might have some that will work if Cat can,t come up with any.

Paul I just had a long conversation with the guy that ran our Cat machine shop dept. at the shop for about 35 yrs. & he did tell me that there was a couple sheets of service parts that Cat had with all the seat part numbers in it.Maybe at your dealer go back to the dept. that does the heads & I,ll bet the mechanic (machinist) can give you the part numbers you need as they work with them every day.

MM - The article you're looking for, is an insert into the Caterpillar Service magazine, Vol 22 - # 10, dated May 29, 1953 .. and the insert is headed "Valve Seat Specifications", and dated 15th March 1953.

This insert lists all the valve seat specs .. and insert P/No's, for all Cat engines from approximately 1928 to 1953.

The insert P/No's for the D315 engine, lists 2 head types .. Head P/No's .. 4F5508 and 3F9903 .. and the valve insert P/No's are .. 1H231 for inlet .. and 1H232 for exhaust.

The inlet and exhaust valve P/No's, will be available from the parts book for your particular tractor.

I will check these numbers here... The Cat dealer is good with part numbers on a computer... terrible finding fiche for the numbers though...

thanks....

Paul

I rely on my local machine shop/jobber for valve seat inserts and installation. I like to know the brand and metallurgy being used. Also be aware that there are two piece valves out there that you don't want. They are known for the valve heads popping off.