SF Oil pump mounting

Allan R

Allan R

Senior member
Location
North Worcestershire
Hi All.
Does anyone know what is used when mounting the oil pump body to the crank case in terms of joint compound.
The green book just says no gasket is used, but when i removed my pump it looked like something had been used. Some kind off locktite.
I'd be greatful for any tips.
Thanks Al.
 
When Gijs Van Dijk fitted my uprated oil pump he used a green Loctite liquid on assembly. I didn't get the reference number.
If he does it then it has to be good practice.
 
I use a rubber based (dries but not hardens) 3M jointing compound the same as I use for crankcases. It is also marketed as Yamahabond, Suzukibond etc. My last tubes were from Allied Bearings in Cairns. Any similar product would be fine but do not use silicone. I seem to recall someone recently saying that the factory did not use anything there but my SF2 had the same stuff as they had at the crankcase joint. Just use it sparingly around the housing surfaces, not where the gears are. Give the pump gears and shafts a drop of oil before assembly, and before you fully tighten the screws fit the drive gear shaft and if needs be tap it gently with something non metallic to ensure the shaft rotates freely.
 
like tippie, i've seen the same sealing residue at the pump as the case halves from the factory
i use a thin coat of hylomar for the joint surface and a bit of cam assembly lube on pump gears and shaft.
the hylomar as it is thinner than the stuff i use on the case halves and i don't want to increase oil pump gear end float
the cam lube because texas heat will keep a bit of oil from clinging to anything  :o
don't forget to restake the fixing screws
 
As this is a forum and as Tippie said, it has to be used very sparingly in order to avoid all the disasters that can be seen on these oil pumps due to these compounds.
 
Can't imagine why anyone would use gasket goo to mount an oil pump... I have only found one pump attached with material - and it was well messed about. Factory practice is best and they are designed to be a flush fit - any material between pump body and case will give end float on the gears. Far worse than any leakage through the housing  ;)

Pete
 
The factory fitted the pumps with a very thin smear of the same stuff they used for crankcase sealing.... 

Replaced a fair few 750 pumps lately, most of them had never been removed since factory fitting.  All had sealing compound on them.

piet
 
Just to correct. It is Threebond 1104 (not a 3M product as my memory failed me) that I use. Google it. It seems to have been replaced by 1194 due to Californian (don?t know what Guzzi has to do with it :-\) environmental reasons but still just as good. It leaves miscroscopic residue upon disassembly so not an issue for end float. The ducks nuts for crankcases.
Ciao
Lee
 
Since I discovered the Permatex Moto 1 compound, I forgot Loctite and others. 1 mm all around the external side of the housing surfaces (or around the cylinder head gasket) make the parts perfectly sealed and last for ever! It is almost liquid so very easy to apply.
 
Thanks for all the input guys. I've got hold of some Loctite 574, which is a zero thickness compound, used on Rover K series cylinder heads.
I'll let you know how it goes.
Cheers Al.
 
Tippie said:
I use a rubber based (dries but not hardens) 3M jointing compound the same as I use for crankcases. It is also marketed as Yamahabond, Suzukibond etc. My last tubes were from Allied Bearings in Cairns. Any similar product would be fine but do not use silicone. I seem to recall someone recently saying that the factory did not use anything there but my SF2 had the same stuff as they had at the crankcase joint. Just use it sparingly around the housing surfaces, not where the gears are. Give the pump gears and shafts a drop of oil before assembly, and before you fully tighten the screws fit the drive gear shaft and if needs be tap it gently with something non metallic to ensure the shaft rotates freely.
Click to expand...

That was probably me and to qualify the comment.. it would of been on 3c engines in the mid to late 70's. I had a number of them apart and never saw any sealer on the pumps, nor did we use any. I can't speak to the twins. We did not build them.

I now use a very thin smear of Loctite 574.
 
sfcpiet said:
The factory fitted the pumps with a very thin smear of the same stuff they used for crankcase sealing.... 

Replaced a fair few 750 pumps lately, most of them had never been removed since factory fitting.  All had sealing compound on them.

piet
Click to expand...

Piet - I'm planning to use Loctite 518 for the crankcase halves.  Would a thin layer of that sealant be suitable for the oil pump housing?  Chris
 
Sure, just use it very sparingly.  If in doubt, omit it...

Make sure the pump spins freely before you button up the cover, and when the cover is fitted, make sure the pump shaft has a bit of axial clearance.

piet
 
I use a thin layer of very heavy grease, it stays in place and doesn't blow out under pump pressure. Also considered using Wellseal, but default to grease.
 
jotacorsa said:
I use a thin coat of hylomar for the joint surface and a bit of cam assembly lube on pump gears and shaft.
the hylomar as it is thinner than the stuff i use on the case halves and i don't want to increase oil pump gear end float
Click to expand...
I wouldn't worry about increasing axial float with a thin smear of sealant, I do a similar job at work - checking axial clearance before and after applying sealant, the difference is undetectable.
 
I believe I used something like ThreeBond 1104 but one thing I did do was change out the Slot Bolts for Allen heads as you get better torque feel.
 
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