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Author Topic: Assembly lube on connecting rod bearings????  (Read 314 times)

Offline thataveragebro

  • Posts: 11
Assembly lube on connecting rod bearings????
« on: Aug 09, 2017, 19:57:01 »
I'm wondering if i need to put some assembly lube on my new connecting rod bearings?? for a 78 cb750k

Offline wahvtec

  • Posts: 289
Re: Assembly lube on connecting rod bearings????
« Reply #1 on: Aug 09, 2017, 20:59:08 »
On the crankshaft side yes
1969 CB350 (barn bike) (sold)
http://www.dotheton.com/forum/index.php?topic=59079.0ooo

1998 Yamaha Riva XC125.  Gotta scoot.

1982 xl185.  "In progress"

Offline Tim

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Re: Assembly lube on connecting rod bearings????
« Reply #2 on: Aug 10, 2017, 00:20:30 »
Motor oil might be a better choice.  I'm no expert but I recall assembly lube being pretty sticky and you want oil flowing through the little passages easily.
"Quality . . . you know what it is, yet you don't know what it is. But that's self-contradictory. But some things are better than others, that is, they have more quality. But when you try to say what the quality is, apart from the things that have it, it all goes poof! There's nothing to talk about. But if you can't say what Quality is, how do you know what it is, or how do you know that it even exists? If no one knows what it is, then for all practical purposes it doesn't exist at all. But for all practical purposes it really does exist."

Offline irk miller

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Re: Assembly lube on connecting rod bearings????
« Reply #3 on: Aug 10, 2017, 06:39:55 »
I don't disagree with Tim.  The crankcase will be full of oil.  I focus assembly lube on bits that are dry during initial start up, like top end components.

Offline cxman

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1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline datadavid

  • Posts: 1120
Re: Assembly lube on connecting rod bearings????
« Reply #5 on: Aug 11, 2017, 11:09:34 »
I have never ever started up an engine dry, i always circulate the oil and verify top end/cam oiling way before i have the nerve to kick it! By then im 100% sure the crank oil galleries are filled, engine has pressure and all is well.
This can either be done by spinning the rear wheel, kicking it over like an idiot for 15 minutes, or by spinning the crank with an air tool.

Offline furu14

  • Posts: 18
Re: Assembly lube on connecting rod bearings????
« Reply #6 on: Aug 13, 2017, 04:09:02 »
I mount plain bearings/cam and parts with a mix of Motul 300Vmotor oil, Kent camlube and molybdendisulfide grease, mixed to a thick slowly sagging "goo"
this mix contains additives (sink-fosforus-molybden)that will prevent scuffing and will wash out with the oil after startup.
if possible i will fill oil-galleries manually after a full rebuild w a handpump.

Maybe not the best way-maybe not the worst... ;)