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D 12 front oil seal
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54f250 View Drop Down
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Joined: 09 Dec 2022
Location: 47135
Points: 35 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 54f250 Quote  Post ReplyReply Direct Link To This Post Topic: D 12 front oil seal
    Posted: 27 Oct 2026 at 8:34pm
i AM REPLACING A LEAKY FRONT OIL SEAL ON MY d 12, i HAVE REMOVED THE RADIATOR , THE FRONT END AND THE PULLEY.  DO I NEED TO REMOVE THE TIMING COVER OR DO I SIMPLY PULL THE SEAL AND REPLACE IT. I HAVE READ THE MANIUALS BUT I AM STILL UNCLEAR.
THANKS. JIM
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 9260 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 27 Oct 2026 at 10:00pm
I've not worked on that engine but have done WD45 and 8000 426's but leaving cover in place and pulling seal with screws and prybar. CLEAN welland drive new in. That's the tricky part as you need a driver that fits the seal and has the depth. Usually something specially fabricated at least for me....
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Acdiesel View Drop Down
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Joined: 15 Jun 2012
Location: Rochester Ohio
Points: 2601 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Acdiesel Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 38 minutes ago at 11:04am
I don't recall the size (1.25" I believe) PVC pipe, I cut it about 5 inches long and that works perfect to install these seals. Its the thinner wall PVC not schedule 40. 

Dan 
D19 Diesel,D17 Diesel SER.3
2-D14, 2-D15 SER.II WF/NF
D15 SER.2 DIESEL
D12 SER.I, D10 Ser.II
2-720'S D21 Ser. II

Gmc,caterpillar
I'm a pharmacist (farm assist) with a PHD (post hole digger)
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