poor oil pressure after changing big end bearings

[1303r]

hi, i had my heads off my engine to check it over and replaced my big ends and piston rings while i was at it. had ok oil pressure before, 2bar at 2000rpm when hot. now have 1bar max when hot . must have buggered something up. just pulled engine out again to try and work out what i've done wrong but can't see a problem the old bearing were std and replaced with the same. could it be a problem with the rockers/pushrods/etc? really don't wanna put it all back together and in the car( ) also where's a good place to get gasket set as last one was £65 from gsf or is that about as good as they get?

[ghost123uk]

now have 1bar max when hot . must have buggered something up. - could it be a problem with the rockers/pushrods/etc?

Now I don't want to sound rude, honestly I don't, but if you think that low oil pressure could be something to do with the rockers or pushrods then you simple don't know enough about engines to be doing such work as removing heads and changing big end bearings.

Also taking the heads of these motors to "check it over" as you mention is really not a good idea because of the way the studs are designed. One often finishes up causing huge problems with broken studs, sometimes resulting in a replacement engine being needed !!

The only likely cause I can guess at is that you may not have torqued the big end bolts down properly ( you did use NEW big end bolts didn't you ?? )

Re Gaskets - GSF are who most folks use for gaskets and the like so I reckon they must be the best source.

Let us know how you get on

[Laurie]

What engine is it?

[1303r]

ok the reason i asked about the pushrods etc is cus hydro lifters and hollow pushrods is something i haven't come across on normal inline engines. anyways after ripping it apart today i've found out that the cam bearings are shot, big chunks outta them . thinking that this may have been caused by me starting the engine up before i got the oil pressure up properly. oh engine is a 1.9 wasserboxer early case type

[1303r]

also just looked on gsf web site for main bearings as may as well replace them too while i'm at it but early 1.9 wasser not listed. they are the same as type1 engine mains arn't they? should i just order a standard set of them?

[Red Westie]

I'm afraid my comment is rather negative as well.
Whilst I commend you for your efforts, fitting new plain bearings to worn main and big end jounals is not good practice, a professional just wouldn't do it.
Have you checked for journal ovality with a micrometer?
Have you checked for bore ovality with a cylinder bore gauge?
Have you checked crank enfloat?
Have you degalzed the cylinder bores after fitting new rings?
Have you inspected the oil pump for wear and checked clearances?
Have you inspected the oil bypass valve for correct operation?

Martin

[1303r]

don't have a mircometer or a cylinder bore gauge only have a vernier. crankshaft looks good, no signs of marks anywhere, cylinder bore's no noticable lip or marks, cross hatching still looks fresh. crank end float is set with shims behind flywheel, yes? new oil pump going on. how do you check the oil bypass valve for correct operation? i pulled it out and made sure it was moving freely in the hole and no signs of wear.

[ghost123uk]

It's just occurred to me Mr 1303r, no one has said "Oh heck mate that must be a bummer after going to all that effort".

I hope you get it sorted now without further hassles

[Mocki]

it occurs to me that you are either very lucky, or deserve to get this spot on!
the reason i say this, is, to take the heads off a early 1.9 and not snap a head stud is unusual, to put it back together and not snap a head stud is, erm, unusualler(made up fenland word) but to do it twice, well, you were ment to get it sorted, good luck!!!

[1303r]

thankyou. i have a few, read 5! engines in bits, two earlies and three lates. only one 2.1. not using that as the compression ratio to high for the turbocharger i fitted . so whats the score on these mains for the early 1.9 then? same as a type1? here's a pic of the engine when it's all in one piece.
[IMG:640:480]http://i196.photobucket.com/albums/aa25 ... C00759.jpg[/img]

[Laurie]

It depends on the age of the engine. If you have thin main bearings and a 3 piece rear main, you have a late engine. if your rear main has shoulders, you have early. Let me know. But later... I'm pissed!

[Grun]

1030r

Now listen up!!

Laurie is The main man. What he doesn't know about 'our' engines is not worth knowing, and if anyone can help you it is he.

Hats off to you for effort, great picture, keep the faith.

Laurie is not the only one who is p!!sed, as you can probably gather!

Oh, and welcome to the club.

Mike

[1303r]

ok well i have all my bits sorted now except for these main bearings. engine is an early cased 1.9. now i have a new set of type1 bearings and they all look the same apart from the flywheel one. did think about re-using the old one but don't think thats really the best way to go, so where can i get a new one? did here that the 2 litre air cooled one and a shim could be used but have no more info so would be great full for any help!!