I'm hoping someone may be able to tell me if A spec engines have a different oil pump gear drive shaft than the B spec.
The block I am rebuilding is an A spec one and the shaft I have seems too thick.
Any clues anyone?
Cheers
Keith
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SP250 Engine Question
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Keith Ashworth
- Posts: 72
- Joined: Fri Feb 19, 2016 2:23 am
- Location: Melbourne Australia
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Dragon
- Posts: 89
- Joined: Wed Mar 02, 2016 12:14 pm
- Location: Goodrich,between Ross-on-Wye and Monmouth, UK.
Re: SP250 Engine Question
Hi Keith,
All I can contribute is this: I understand that the A-spec engines' normal running oil pressure was 30psi, but the B/C-spec engines' was 60psi. This is seen in the oil pressure gauges which showed a pressure range of 0-60psi for the A-spec and 0-100psi for the B/C-spec.
This difference might only be caused by different pressure relief valve settings, but could indicate a physical difference.
Suggest you ask Russ Carpenter; he will be certain to know!
All I can contribute is this: I understand that the A-spec engines' normal running oil pressure was 30psi, but the B/C-spec engines' was 60psi. This is seen in the oil pressure gauges which showed a pressure range of 0-60psi for the A-spec and 0-100psi for the B/C-spec.
This difference might only be caused by different pressure relief valve settings, but could indicate a physical difference.
Suggest you ask Russ Carpenter; he will be certain to know!
Wilf,
SP250 104008, Herefordshire.
SP250 104008, Herefordshire.
Re: SP250 Engine Question
I dont know for sure, but an official 'parts book' would confirm. I doubt this is a part they would change in production.. Ive only got B spec and saloon blocks for comparison.. The shaft is sometimes tight to remove ..and seems like it does not want to go back in IF its not properly prepped up and has surface crud on it ( all that is needed to prevent it fitting easily is a very thin layer) as the hole in the top part acts as a support bearing so clearance is tight, with main thrust taken on the washer just below the bronze gear.
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Keith Ashworth
- Posts: 72
- Joined: Fri Feb 19, 2016 2:23 am
- Location: Melbourne Australia
Re: SP250 Engine Question
Thanks txt.
I'll give it a good clean as it does have some surface rust on it.
Keith
I'll give it a good clean as it does have some surface rust on it.
Keith