58 Big Twin crank lower seals

This topic has 8 replies, 3 voices, and was last updated 2 years, 10 months ago by frankr.

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June 18, 2021 at 12:59 pm #240529
dfs
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1958 Big Twin. Removed lower unit to replace shift seal and when about to reinstall unit, shining a light up into the housing, I see loose parts through the passage to the crankshaft. Assume they are crank seal, retainer, spring and whatever else. Fig E59 12-18 in my condensed service manual. Of course, engine seemed to be running fine last fall before winter hibernation. Photo attached.

Looks rather daunting, never been into this engine area before. I have been searching without success for You Tubes or references, but nothing yet. Any pointers from this forum’s knowledge base? Thank you.
June 18, 2021 at 1:03 pm #240530
dfs
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Try again to add photo.
June 18, 2021 at 2:11 pm #240535
fleetwin
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US Member - 2 Years
Well, if the lower seal parts came loose, it seems as though they would have fallen down the driveshaft on top of the impeller housing….
In any event, you have to remove the powerhead to service/replace the lower seal components. I just don’t want you to pull it all apart if there is nothing wrong….

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dfs
June 18, 2021 at 2:32 pm #240538
frankr
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Nope, loose parts will stay up in there. Powerhead has to come off. Not as hard as it looks. BTW, there is an upside down to the retainer ring, maybe why it fell off.

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dfs
June 18, 2021 at 6:48 pm #240553
fleetwin
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US Member - 2 Years
Oh OK….I guess I was asssssuming the snap ring came off which would allow the parts to fall down…Or is there something up there on the exhaust hsg that might hold the stuff up there without the snap ring?
June 18, 2021 at 7:30 pm #240555
frankr
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Unless I have to eat my words, there is a “shelf” a couple of inches down from the top surface, with a hole for the drive shaft to pass through.. Supposed to shield the seal area from exhaust nastys.
June 19, 2021 at 7:51 am #240584
dfs
Participant
Yes, there is shelf where seals have landed. If I finally attached my photo, they are seen scattered off-center of the thru hole.
June 19, 2021 at 8:02 am #240590
dfs
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Visual inspection, I’m ok with hex and slotted screws underneath that tap into the powerhead, but what about these two hex nuts, are they on studs or hidden thru bolts?
June 19, 2021 at 10:13 am #240603
frankr
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They are on studs. There are also two 1/2″ hex bolts on the side, coming up from outside. And a screw holding the silencer to the lower motor cover pan.

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dfs
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