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Old 11-28-2016, 04:10 PM
cushride cushride is offline
Join Date: Feb 2008
Location: Seattle
Posts: 9
Crack in housing for oil pump


While wrapping up work to add guts to kicker and 2nd gear dremel fix with washer move, I cracked the housing for the oil pump.

I've search forums but only seem to come up with torque of 14 ft/lbs and loctite on the bolts during install. Or, hand tighten.

I don't think I was anywhere near 14 ft/lbs before the housing cracked.

It seems to me that two of the three bolts are on the same plane and one of the bolts, the closest to the rubber o-ring, sits off a bit. I've attached picture with hopes to better explain. It has red line added to show difference in where housing connects.

I can see why I cracked this because the third "offset" ?? bolt when tightened will want to bend the housing.

I figured I'd see all sorts of posts about this but I'm not so perhaps I'm missing something.

The replacement oil pump was similar. Before I call the installation good I'd like to see if anyone who is familiar with what I'm saying has to say.

I can torque two of the three but am scared to torque the third, even with beefy new o-ring, as I don't want to crack it too. Of course I'm also scared an inproperly tightened third bolt will fall out while I'm on the road.

If the pictures don't post I'll try another method.


Thanks for any input,
79 XS1100F
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Old 11-28-2016, 04:11 PM
cushride cushride is offline
Join Date: Feb 2008
Location: Seattle
Posts: 9
Take two:
<img src="http://www.chriskraft.net/oil_pump_crack_640x480.jpg">
<img src="http://www.chriskraft.net/oil_pump_bolt_diffs_640x480.jpg">
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Old 11-28-2016, 05:47 PM
bikerphil's Avatar
bikerphil bikerphil is offline
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Location: Broward County, S. Flori-DUH
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Moderator may want to move this thread to the Technical Discussion Forum.

First of all, the proper torque spec for the oil pump housing to the engine is 7.2 ft/lb. and NOT 14. Use some threadlock blue if you are worried about them falling out.

Why the unit is not sitting flush is new to me, never heard of that. There are locating collars that go around 1 or 2 of the bolts, make sure they are the correct ones and are not too long. If you had the whole engine apart, maybe the collar(s) got mixed up with a longer one used elsewhere.

79F - owned since '89 - FJ fork mod, solo seat mod, Dyna 3Ω's, 14MM M/C (168K miles)
79SF - every day rider, solo seat mod, Brembo 16MM M/C, Accel 3Ω's, Supertrapp (125K miles)

"If it ain't broke, modify it"

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Old 11-28-2016, 09:20 PM
motoman motoman is offline
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Totally agree with bikerphil.
81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.
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Old 11-29-2016, 11:18 AM
cushride cushride is offline
Join Date: Feb 2008
Location: Seattle
Posts: 9
Thanks guys. I'll drop the pan today or tomorrow after work and take a look. No oil in yet!

I'm expecting to see the housing flush where the two bolts with locating collars are, and a small gap between housing and surface where o-ring is. But, it definitely sounds like I'm missing something or off somewhere since this doesn't jive with your experience. That would make sense and also explain why I haven't found lots of posts with similar experiences!-)

I'll post pictures of it mounted either way. And thanks again for chiming in on this.
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Old 11-30-2016, 10:16 PM
cushride cushride is offline
Join Date: Feb 2008
Location: Seattle
Posts: 9
URL is for pic showing gap.

The other two of the three bolts are flush and when tightened appear to result in solid metal to metal contact so I can't see that collars causing an issue. I know the o-ring will seal as it is supposed to - I can see it does get squished.

Short of the long - I'm going to torque the two bolts where the housing is flush, and the other other one, the one in the pic, I'll go lighter on. I'll use the loctite on all three and call it good.

I'm looking forward to having a solid second gear and being able to kick it over if not just for fun!

Thanks again guys, Chris
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2nd gear fix, cracked housing, oil pump, oil pump bolt torque

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