It is currently Tue Oct 22, 2019 1:01 pm




Post new topic Reply to topic  [ 8 posts ] 
No oil pressure again 
Author Message
On the Road

Joined: Wed Jul 31, 2013 11:47 am
Posts: 835
Location: Kano north Nigeria
GTM: Cox/Coupe
Post No oil pressure again
Hmm thought that problem was fixed?? with plugs out cranked the beastie but no oil pressure after about 6 weeks away, removed oil pipe from the block to the oil cooler primed it and turned the engine backwards to wet the pump and we have pressure, tried again after about an hour and lost its prime again!!!****, this was a running engine when last used 20 years ago,
The only good news is I have a painter coming with colour swatches this afternoon so maybe I can start getting the body prepared soon.
John


Mon Sep 30, 2019 7:07 am
Profile E-mail
Where is my Number Plate?
User avatar

Joined: Mon Oct 01, 2007 7:25 pm
Posts: 937
Location: Near Milton Keynes
GTM: Cox/Coupe
Post Re: No oil pressure again
Did you change the oil pump?

It sounds like it’s worn out, and the oil is just draining back
to the box. I’d the pump is badly worn, it can’t draw the oil back up.

_________________
THE WORLD'S FASTEST 'A' SERIES COX GTM Standing 1/4 Mile in....13.502 @115mph MITP 08


Mon Sep 30, 2019 9:41 am
Profile
On the Road

Joined: Wed Jul 31, 2013 11:47 am
Posts: 835
Location: Kano north Nigeria
GTM: Cox/Coupe
Post Re: No oil pressure again
:( Sadly I think you could be right, not sure how 20years standing wore it out and it shows 40psi cranking on the starter motor, but at least the body work is off, about to go to the painters if he can find RAL 1003 or 1007 paint.
Next weekend wheel the engine crane into position for another 3 step backwards??
John


Wed Oct 02, 2019 9:29 am
Profile E-mail
On the Road

Joined: Wed Jul 31, 2013 11:47 am
Posts: 835
Location: Kano north Nigeria
GTM: Cox/Coupe
Post Re: No oil pressure again
Anybody had experience of Mini Spares Evo pumps, a lot more costly, claimed higher outputs than standard pumps, but less than the turbo pump output, which is about 1/3 the price, I doubt I need extra oil output? so should I go for the standard 1275 pump, which is fitted the last time I put the engine together all those years ago.
Thanks
John


Thu Oct 03, 2019 10:52 am
Profile E-mail
Looking like a GTM

Joined: Wed Sep 30, 2015 8:25 pm
Posts: 153
GTM: Cox/Coupe
Post Re: No oil pressure again
Standard pumps are good enough in my opinion. The important thing to do is to Zero tolerance them on a lathe. A lot of the so called "performance parts" are a con, unless you're revving to 8.5k standard 1275 parts won't break.


Thu Oct 03, 2019 10:47 pm
Profile E-mail
On the Road

Joined: Wed Jul 31, 2013 11:47 am
Posts: 835
Location: Kano north Nigeria
GTM: Cox/Coupe
Post Re: No oil pressure again
Hi Grizzler,
I was regularly using up to 8400 revs in my 1400 bush racer mini back in the day when we had motor sport here in Kano, before putting the engine in my GTM, when you say zero tolerance I'm guessing you reduce clearance between the housing and back plat so the rotor and outer ring of the pump are a very snug fit, not much you could do to alter rotor tip clearance, or a loos O/D of the outer ring in the housing other than replace?
Regards
John


Fri Oct 04, 2019 6:04 am
Profile E-mail
Looking like a GTM

Joined: Wed Sep 30, 2015 8:25 pm
Posts: 153
GTM: Cox/Coupe
Post Re: No oil pressure again
Exactly, the gap should be 0. makes a big difference to the performance of the pump. I have also done the mod you suggested way back of using the bosses on the block to route the oil through the filter first. All aids the engine reliability and wear.


Fri Oct 04, 2019 6:35 pm
Profile E-mail
On the Road

Joined: Wed Jul 31, 2013 11:47 am
Posts: 835
Location: Kano north Nigeria
GTM: Cox/Coupe
Post Re: No oil pressure again
Cheers Grizzler,
I still have the 1275 pump removed when I built up my 1400 engine, when that is stripped I can compare the 2 pumps out of curiosity, when I build engines I always fitted new pumps, seals, bearing, etc. such a pain in the ass to strip out, wish it was a Xflow ford with the pump on the outside of the block :(
John


Sat Oct 05, 2019 6:13 am
Profile E-mail
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © phpBB Group.
Designed by Vjacheslav Trushkin for Free Forums/DivisionCore.

phpBB SEO