Looking for specs on HOW to O-RING Oil pump?

[tommiebsmith]

I am looking for specs on correct part # or size and make of the Oring
to purchase and the correct depth and width of the groove to cut in the pump..

what kind of groove works best V-U- square.. ?

groove location distance from back of pump also?

Thanks in advance!

I'm running into the common loose fitment of the oil pump into a case..
so I would like to know how to address this..

I have gone through everypump around me and it is the case opening that is out of spec or usuable spec.. by about .008

[craigman]

The best way to address it is, get another pump. The problem is well known.
And FYI, you can buy a O ring oil pump from Wolfgang. They do the procedure their inhouse.
But if you want to do it yourself, you'll have to measure the case, the oil pump, and then chuck it up in a lathe.

Good luck!

[tommiebsmith]

Yes... I will be doing this myself..

I have found all the places that sale them..

but I would like specific information on the Oring and groove..


It seems that the general what to do has been covered but I have not found
any specifics on doing it say "properly"

all the companies that that sale them must have a program used
that locates the groove and cuts to specific depth and width.. and they use a specific or even general Oring.. so this information should be obatinable..

and if case and Pump play a factor in the end result then selling them or even buying them in bulk is a waste of time?? IMHO..

[chrisflstf]

Its not likely companies that provide this service, will give you the info for free. You could buy one and reverse engineer it, but you may not need more than 1

[tommiebsmith]

Of course those companies don't share..

but are you telling me not one of these awesome samba guru's know
this information and are not up for sharing?

If that is the case it makes me sad that the world acts like this..

[Dougy Dee]

Any competent machinist should be able to figure this out.

[tommiebsmith]

Yes.... and I can figure it out also..

I have a Lathe and plenty of brain power to figure it out..

but I ask to save some time and possibly money.

It can't be that everyone is only general knowledge smart
round here..

[mark tucker]

hmm measure your case,& o ring & then put it where it needs to be.I have seen some cases that the oil galley is so close to the edge there might not be much room for error. also the hardness (durrometer)of the o ring might be an issue. I would use an silocone or soft o ring if possiable. but installing may only be done with case split. I had thought about a lip seal from an auto trans drum.but never did it.good luck

[tommiebsmith]

I tend to think half the distance of the oil hole and out side edge of the oil pump / or half the distance of oil outlet and inside of the case..

or a combo of both to insure the Oring sets properly in that little available area.. infact if the pump sticks out behind the case then the half distance
on the case of oil outlet and the inside of case seems to be the better location to align the groove in the oil pump..

and then depth of cut may be based on how thick the O ring is .. so you'd be looking to have X exposed.. this would be the sealing of your oil pump OD and case opening ID difference..

then the choice of O ring is made based on heat and oil resistance..

then thoughts of how deep the groove is to keep it from being sucked in on the inlet set.. so a large OD Oring and deeper groove would be a good choice.

also chamfer the oil pump hole on the case a bit... and both the oil in and outlets on the case.. because when istalling even heavily lubed up you wouldn't want them to tear the Oring on insertion??

or would installing the pump with the case halves apart be suggested?
and then making sure you get a good sealant on the lip side so as to not
have a leak at the pump...



Maybe someone else can aid in the thought process..

Thanks!

[chrisflstf]

Lowbugget has them for $40-$45. Buy one and U will have all your answers.

http://www.lowbugget.com/main_page.html

[tommiebsmith]

You may be correct ....

Still looking for eduction via Samba from this board..

so the quest continues..

[craigman]

[neil68]

[AlteWagen]

[mark tucker]

hmm by the gap between the oil pump and the case the "o" ring will not be sealing any thing but your thoughts as it will be too far in to seal agnist the case.or you are using more smoke & mirrors.

[DarthWeber]

That's called a shadow.

[2manybugs]

As far as the groove size and depth for the ring you choose , you can get a "O" ring catalog at a bearing or hydraulic shop and all of the groove specs will be in there for you. Follow their specs and you will probably not go wrong. You might even find the catalog info online.

[craigman]

Also the case has to be split to install a O ring oil pump or you will tear the O ring "pushing" it in.

[tommiebsmith]

[/quote]

This 30mm pump looks to be deep and extends past the case inside..
looks easy enough with this pump.. not sure I want to do a 30mm pump.


My whole question started off based on the idea of location..

My 26mm pump has a body depth of .970 and in the case the openings
for the inlet and outlets are .846 to the edge of the hole and 1.00
to the edge of the case opening into the cam chamber.

so if you try to center the line basically where the O ring would work best your want the groove at about .920/.921 back from the mounting lip
of the oil pump to center on the case which get's it extremely close to the lip of the oil pump and chucking it up in the lathe not to easy..

then goes the thickness of the Oring.. as a portion of it will be inlet/outlet
holes...depending on how thick it is.

This all before gaskets or sealants play any factor with the end o RING final location result.

[2manybugs]

Just use a 4 jaw chuck and hold on the square end. Indicate the oil pump in and you can put the ring groove anywhere you want.