Replacement Engine

[Matt48]

Haynes says 28 min to 42 max psi

mine goes 10 to 25 on test at the garage,

problems

 

[Matt48]

low oil pressure

keep em coming cheers

How do you define low oil pressure?

If you've got a gauge, approx 10 PSI per 1000rpm is about right...

I ran my engine in a few weeks ago - did approx 20 mile of varying speeds and loads, then did a 200 mile round trip up the motorway - sat at 55-65mph the whole way.

So where did you get your engine from?

 

[Zcat7]

Well it sounds like you have some problems. The oil pressure I'm not sure about. You mention it starts of at 10 PSI then rises to 25. Again if they are your cold start-up, hot running figures with 30w 0 oil I might not be that surprised and I'd say it's relatively normal.
To answer your original question; it depends on how good your mechanical skills are and how quick you want to get the bus back on the road. There are a lot of good recon suppliers out there and varying degrees of engine builders. I rebuilt my engine (cracked block) in a new case and upped the capacity to 1776 with new barrels and pistons at a fraction of the cost of a new 1776 but that's not for everyone. You might only need a crank regrind and new bearings and you're back on the road, which is a damn site cheaper than a recon engine if you can do it yourself. It's for you to decide.
I'd still like a better diagnosis and more info though... What occurs when, cold oil pressure/hot pressure figures at what revs, under what conditions does it knock, does the knock change with engine under load, is the knock there when cold, what grade oil is in there etc etc

 

[ozziedog]

I finally caved in last year and swapped over to multi flavour oil and I got to say two things about the differences, one is it`s a little quieter and the other is that it dosen`t use oil like when using straight thirty. The place you mentioned in Bristol has a very solid reputation and history with VW`s so I`d be a little surprised there, and as a side note have you tried ringing them and asking if they know anything? maybe about the motor or the previous owner? You may find something in the busses history that may help with your Diagnosis and decision on what to do. And telling us about noises or rumbles is one thing but maybe a couple of minutes of video so we could listen to it would be a help, if you can`t do it I bet one of the kids in the street could show you how it`s done, that`s where my tecky help comes from :mrgreen: I wouldn`t doubt your mechanic / engineer for a second but I would want to know what he is basing his decision on. If it`s driveable and still running I wouldn`t hesitate in stripping it down and rebuilding it. If when you strip it down there is monstrous bad news, then that`s how it goes But if it`s running, it can`t be that much. If you are wanting to use this as an excuse to justify going bigger in cc`s then just do it anyhow, but get some anchors to go with it :mrgreen:

Ozziedog,,,,,,,,,,,,,,,, Video pleeeeeeeeeeeeese :mrgreen: :mrgreen:

 

[Matt48]

I'm happy with a 1.6 and pootling along, good shout I'll do a video of it running

 

[Tofufi]

low oil pressure

keep em coming cheers

How do you define low oil pressure?

If you've got a gauge, approx 10 PSI per 1000rpm is about right...

I ran my engine in a few weeks ago - did approx 20 mile of varying speeds and loads, then did a 200 mile round trip up the motorway - sat at 55-65mph the whole way.

So where did you get your engine from?

I rebuilt my old one in my kitchen, with a LOT of help/guidance from a friend. There's nothing terribly complicated about doing it if you've the time and inclination.

What oil have you got in it?

From what you've said, I'd start by doing a full service including using 20W50 (or straight 30 if that's your preference) oil. Just make sure it doesn't have 0W30 or similar in it, as that's rather thin for one of these...

 

[Matt48]

it did have Castrol in it, well topped up, from previous owners oil, it now has had an oil change.


The other thing that happened that may be linked was the exhaust went but the new one fitted has not got rid of noise, but has reduced it

video tomorrow with sounds.

 

[Tofufi]

it did have Castrol in it, well topped up, from previous owners oil, it now has had an oil change.

What grade of oil has it got now?

10W40? 20W50?

 

[Matt48]

you know what I don't know, some sort of Duckhams.

 

[Matt48]

ok so I'll get it out of the garage, record her running. So what oil should I put in

 

[user 20733]

I run Halfords 15W40 mineral oil. Engine runs fine. There is a lot of opinion on what oil to use. Personally I think 20W50 is too thick and stay away from synthetic.

 

[Matt48]

got to say Castrol.

Ok so I go over to an aircooled garage in Waterlooville to have a chat with them and they are in the middle of picking up a guy with a vege rebuild on the blink, so not building my confidence up.

 

[rlepecha]

I run 5w30 fully synthetic cos it was £12 recently for 4 litres at halfrauds. I believe 5w30 is what is recommended in the VW manuals from -10 to 30 degrees Celsius. Or something like that

Anything over 40psi oil pressure means it is bypassing the oil cooler. Hence you don't want oil pressure that high.

 

[Zcat7]

Anything over 40psi oil pressure means it is bypassing the oil cooler. Hence you don't want oil pressure that high.

Interesting! What's the reasoning behind this and/or the likely causes of the bypass?

 

[KateLovesPurple]

Anything over 40psi oil pressure means it is bypassing the oil cooler. Hence you don't want oil pressure that high.

Interesting! What's the reasoning behind this and/or the likely causes of the bypass?

The reason is to prevent over pressurising the oil cooler which may burst and is done by the oil pressure relief valve. Not a fault but a built in part of the engine.

 

[Zcat7]

So is it a case that as soon as the pressure reaches 40psi then ALL oil bypasses the cooler or just that the excess pressure is bled off through the relief circuit?

 

[KateLovesPurple]

It doesn't switch direction, it does as you say, bleed off the pressure past the oil cooler.

Have a look at this site, it probably explains it all better than I could.

http://www.vw-resource.com/oiling_system.html

 

[rlepecha]

It doesn't switch direction, it does as you say, bleed off the pressure past the oil cooler.

Have a look at this site, it probably explains it all better than I could.

http://www.vw-resource.com/oiling_system.html

As above, anything over 40psi is therefore uncooled(to an extent, the sump provides a bit of cooling). Below 40psi your supposed to be cooling all of the oil, in theory.

 

[Matt48]

New exhaust on and drove her home, unfortunately my camera battery died so recording tomorrow.

The jury is out on the engine still.

 

[Matt48]

https://fbcdn-vthumb-a.akamaihd.net/hvthumb-ak-xpa1/v/t15.0-10/s480x480/10502746_10204749339957192_10204749326276850_28858_1856_b.jpg?oh=e22d91a9b7d7110f9c12ba983151874b&oe=5493F528&__gda__=1422403254_fa2f21227de501359b929e82e1892e6e