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Thread: CAT 955K TURNS over but wont run.

  1. #106
    Senior Member AllDodge's Avatar
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    Apr 2011
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    Kentucky
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    922
    Looking up in SIS I found 5s7221 is the exhaust valve seat insert on serial numbers 85j4672 thru 6246. Part number 1070268 is also a valve seat insert on a lot of motors
    CAT 416C 4ZN21998
    CAT D3B 27Y03918
    CAT 955L 85J05044
    International 1997 4700 Dump 466DT
    Grove DZ66 Manlift
    Terramite T5C

  2. #107
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    Jan 2017
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    NC, UNITED STATES
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    37
    Yea, didn't look like anything I needed.

  3. #108
    Senior Member
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    Mar 2012
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    Central New York, USA
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    Quote Originally Posted by Cmark View Post
    Be aware that the precups changed part number several years ago and they use a different O ring. A couple of times I have been caught out by ordering the correct O rings for the serial number, only to find that later precups have been fitted at some point.
    I wasn't aware of that. Do you know how to tell the difference?

    I did a search on NPR for the 8S3970 and it looks like that is an updated number for the 8S3990 chamber but there is no reference to a service magazine or mention of a change to the oring. Was this change on a 3304 or some other prechamber engine? Not doubting just wanting to learn something new, so the day is not a total loss!

  4. #109
    Senior Member Cmark's Avatar
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    Gold Coast, Australia
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    Quote Originally Posted by kshansen View Post
    I wasn't aware of that. Do you know how to tell the difference?

    I did a search on NPR for the 8S3970 and it looks like that is an updated number for the 8S3990 chamber but there is no reference to a service magazine or mention of a change to the oring. Was this change on a 3304 or some other prechamber engine? Not doubting just wanting to learn something new, so the day is not a total loss!
    From memory, the early ones had the white O ring that suffers from perishing. Later ones have a yellow silicone O ring that's a different size.
    So, what's your serial number?

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