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1725 Oil Pump

C

CptTom

Donation Time
I'm in the process of rebuilding a 1725 motor. I ordered and received a new oil pump from Sunbeam Specialties. Problem is the new pump has 11 teeth on the gear that meshes with the cam. The old oil pump has a gear with 12 teeth. I'm waiting for Sunbeam Specialties to get back to me but in the meantime any feedback from anyone who has experience with this issue would be greatly appreciated.

CptTom
 
husky drvr

husky drvr

Platinum Level Sponsor
1725 Oil Pump

I'm in the process of rebuilding a 1725 motor. I ordered and received a new oil pump from Sunbeam Specialties. Problem is the new pump has 11 teeth on the gear that meshes with the cam. The old oil pump has a gear with 12 teeth. I'm waiting for Sunbeam Specialties to get back to me but in the meantime any feedback from anyone who has experience with this issue would be greatly appreciated.

CptTom
Click to expand...

CptTom,

The pump drive gear and camshaft must have matching numbers of gear teeth - 11 and 11 or 12 and 12. The different gears do not mesh and will cause damage if they are installed together and rotated.

HTH
 
P

pruyter

Donation Time
I will confirm that 1725 cc engines have 11 teeth while the 1592 cc engine has 12 teeth, so the new pump you received from Sunbeam Specialties is the right one. If your engine is really an original 1725 cc engine than it should not be possible that you have an oil pump with 12 teeth.

Regards,

Peter
 
SoCal'beaming

SoCal'beaming

Donation Time
Check with Rick first that he's sent you the right pump...I've received the wrong parts more then once myself.

... David
 
P

pruyter

Donation Time
If an oilpump for a genuine 1725 cc engine is ordered from Sunbeam Specialties than the right one is sent (11 teeth), so checking out if SS has sent the right parts is to no use at all!
If in your engine, which you say is a 1725 cc engine, a 12 teeth pump is needed
than it lookes like a 1592 camshaft is installed.

Regards,

Peter
 
SoCal'beaming

SoCal'beaming

Donation Time
Thanks for the info Peter ... didn't know you could swap out the 1725 cam for the 1592's ... What would the benefit/possible reason be for such a swap.

..... David
 
husky drvr

husky drvr

Platinum Level Sponsor
The benefit is the retention and operation of the mechanical tachometer in the earlier series cars. The early style drive gear for use with the mechanical tach is slightly longer than the later style drive gear. Actually, the mechanical tach style drive gear is slightly longer than any standard length drive gear that does not drive a tach. In other words, an oil pump drive gear from a S IV 1600 would not be long enough to engage the drive dogs on an earlier series mechanical tach drive distributor.

The other possibility is that someone who previously worked on the engine replaced a defective part with non correct but functional part they had on hand. The only thing you really have to be aware of is to ensure a camshaft for an iron head engine is not installed under an alloy head ( or vice versa ) due to different valve order layouts.
 
SoCal'beaming

SoCal'beaming

Donation Time
Thanks Don .... Should I assume the cam profiles are the same or close? or is the earlier cam a little more robust?

... David

*** sorry ... didn't mean to hi-jack the thread ... just info "Hungry":D
 
Last edited:
husky drvr

husky drvr

Platinum Level Sponsor
SoCal'beaming said:
Thanks Don .... Should I assume the cam profiles are the same or close? or is the earlier cam a little more robust?

... David

*** sorry ... didn't mean to hi-jack the thread ... just info "Hungry":D
Click to expand...

David,

If the cams are stock, the 1725 alloy head cam is the most "robust". If the cam has been reground, it could be fairly different from stock.

Try this link and scroll down to page 30 to check out the cam info that Jan compiled.

http://www.sunbeamalpine.org/alpine_marque/issue_7
 
C

CptTom

Donation Time
Thanks for the feedback on this issue. Apparently I have a 1725 block which at some point had a 1.6 camshaft installed. At this point I think I must go in search of a correct 1725 camshaft and try to get this motor fitted with the correct parts.
 
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