101 replies to this topic

[booton]

i wasn't just relying on a switch just wanted it as a back up just in case my gauge wasn;t working. ( knowing my luck lol)

fitted all new seals on the gearbox now. not going to get a better seal.

going to try Friday to prime pump to see if i can get pressure. once battery charged.

if not will be removing oil pump adding a few washers to the oil pump bolts see if they are to long and not tighten up enough.
been really busy lately not had chance to do much.

but should work friday i'm confident. lol have to be.

[booton]

ok primes oil pump today, with a good battery i turned it over for 30sec nothing took the oil pressure pipe of to see it any oil would come out. so turned it over again for 30 sec.

tired again for a few seconds. still nothing not a dribble.

primed the oil pump but turning the fly wheel clockwise turning the engine backwards put over half a litre in.

check the springs it was the correct length 72mm.
and it moved freely inside.

took the oil pump of was full of oil. gasket on correctly but the gasket was very oilly.

may be not tighten up because of the bolts being so long. any other ideas,

how do i know if the pump is no good.

[booton]

i guess i need a new oil pump gasket now. though.

[dklawson]

how do i know if the pump is no good.

I thought you rebuilt the engine? Anytime you rebuild a Mini engine you really should replace the pump with new. It is false economy not to.

The physical clearances that you need to measure on the pump are in the manuals. If the pump is loose when the bolts are tightened you are correct that you will possibly have no oil flow. If this is what you determine you can shorten the bolts or add a washer under the head of the bolt if space allows.

[liirge]

Did you replace that gasket on the pick up pipe? and do up the bolts again?

[bmcecosse]

It must be obvious if the pump isn't tight when bolted down - surely?? Remind me - is this a small bore engine or large bore (1275)? And -were the new gearbox flange gaskets paper thin?? I have to assume you have the timing chain fitted - is the camshaft turning ?? No chance the key has fallen out ????

[booton]

the oil pump is brand new from mini spares.with my luck it could be a faulty one not ruling that out.
i was wondering how you could tell.

the pick up pipe or anything on the gearbox side i have not touched it came of my other engine which worked fine.

the engine is a 998 pocketed with a 940head.
the gearbox gaskets were paper thin 0.19mm thick. compared to .5mm for the others i had.

the timing chain is fitted and turning.
could it be the oil pump.

[mini 4o]

hi
have you checked / refitted the core plugs for the oil galleries ? maybe the machine shop removed them for cleaning

john

[liirge]

the oil pump is brand new from mini spares.with my luck it could be a faulty one not ruling that out.
i was wondering how you could tell.

the pick up pipe or anything on the gearbox side i have not touched it came of my other engine which worked fine.

the engine is a 998 pocketed with a 940head.
the gearbox gaskets were paper thin 0.19mm thick. compared to .5mm for the others i had.

the timing chain is fitted and turning.
could it be the oil pump.

For the SECOND time now, you said you had to do up one of the bolts at the back of the box that pinches up the oil pick-up pipe.
I said to you, that may have disturbed the gasket and now it doesn't make a seal, I also said you may as well do it, to completely eliminate the problem so you wont have to strip the box off again.

With such a long winded problem it seems completely counter-productive not to listen to advise given or replace that gasket whilst you had the chance,

I quote you from page 3:

ok fitted the new Tim oil pressure gauge today, primed the oil pump, checked the bolts where the pick up is for the oil the one directly under Neath i turned 3/4 so hopefully that was the problem.

Edited by liirge, 17 December 2011 - 11:28 AM.

[booton]

sorry i tightened up a bolt connecting the gearbox to the engine not to the oil pipe up sorry. for the confusion.

going to wait for my bits from mini spare a new oil pump gasket, a ball bearing and spring for the pressure relief valve.

add a few washers to the oil pump and i'll take it from there.


thanks for your help liirge, sorry for the confusion.

hi
have you checked / refitted the core plugs for the oil galleries ? maybe the machine shop removed them for cleaning

john

unsure what u mean here.

[booton]

i have oil pressure yess lol.

parts finial came today . dam minispares are slow.

fitted new oil pump gasket used two flat washers torqued the three bolts to 11nm. went around three times to get equal pressure.

also fitted the new ballbearing pressure relief valve kit.
i knew it was going to work, as when i was priming the oil pump i could here it sucking which it never did before.

i put the engine back together on the floor used a set of jump leads to turn it over again as i have the oil pressue sender of i could hear the pump working and even though the engine was turning over very slowly( due to having cheap crap jump leads, prob only 3mm think inside.) the oil came out with a constant pressure. once i stop it continued to come out.

so very happy now. will refit engine when i can get one of my mates round to help lift it in again lol. but for the last time. very happy can hear that its working well.

thanks to everyone for the advise don;t know where i would be without this forum.

[booton]

sounds like the original problem was caused by the oil pump gasket. sometimes the bolts are too long depending on the manufacture of the pump, with the bolts bottoming out before they really clamp down on the pump. This leads to the gasket blowing out when the engine is run up.

I've ran an engine un knowingly without an Oring between the block and gearbox and I had no problems with priming or oil pressure. I did use a smear of RTV on the mating faces of the block and gearbox though. what did happen was with the ball bearing, the oil pressure fluctuated at higher rpms quite dramatically with the engine under high load, and eventually killed the center main bearing

thanks sprocket you had it spot on. never would have thought of that.
just wish i did this first would have saved weeks lol.