Low oil pressure in my 3B

[BillyGHusk]

well it looks like I have a by pass filter for sale.

Thanks again to everyone for the hand holding and helpful insights.

Tim

 

[lostmarbles]

Hi Tim - My hands are all grey and blue (POR15 + topcoat) and I've finished spraypainting for the day. (It's getting c-o-l-d outside too!)

I just thought I should clarify my opinions here.

Firstly - In support of your original idea in fitting that Amsoil: - Surely it isn't possible to have one's engine oil "too clean" so cleaning it "beyond normal" can't really be a bad idea. (As to how much longer engine life you achieve by doing so - Well that could probably be debated forever.)

Secondly - I always thought such a thing was supposed to be fitted into the bypass line from the "oil pressure relief valve that manufacturers fit to limit max oil pressure". And I thought manufacturers fitted these to most engines.

Thirdly - Studying the Toyota oil flow schematic above and reading the Toyota labelling - I now think Toyota installed our relief valve(s) for different reasons. - And so now I don't think it would be possible (looking at the manual) to fit your Amsoil into any of their circuits without reducing the oil flow/pressure to your engine bearings. (Someone please tell me if I'm wrong.)

Now Toyota has kindly omitted the oil flow to our vacuum pumps from the oil circuitry diagram. I suspect that flow is actually restricted (probably by some sort of orifice) and I think the vacuum pump dumps that oil (along with any air that it sucks) into our engine crankcases. So IF I'm right in this belief.... You may be able to fit your Amsoil into this oil feed line (which is the smaller of the two hoses to your vacuum pump). And you could even divert the outlet to your oil filler cap if you still want extra oil up at your rockers.

Just ideas/thoughts (and a bit of guesswork)........But I will understand if you decide it isn't worth the hassle. After all - That's probably why I haven't considered fitting a similar filter.

 

[BillyGHusk]

Tom,

I agree with point 1. Hence the install. I realize that most people feel it isn't necessary, and they are probably right. But at this point I paid for it and if there is a way to install it with out compromising oil pressure I would like to do that at some point.

Tim

 

[cruiserjunktion]

Glad you have it figured out.

Is your edic hooked up?

How do you turn the engine off?

 

[BillyGHusk]

There is a button the PO set up that kills it.

I am somewhat ashamed to admit that I'm not exactly sure how it works. I thought he said it used a vacume, I guess I assumed it went to the edic.

 

[83bj60]

Where does your Amsoil bypass filter get its oil pressure/flow from Tim?

I was just wondering whether the Amsoil filter could somehow be responsible for your low oil pressure problem.

I don't know much about them but I assume it should get its supply of oil from the bypass valve located on your stock oil filter housing.

And doesn't this bypass valve open only when your oil pressure exceeds specification (or am I wrong there)? If so - shouldn't your Amsoil filter be getting starved of oil (for it to filter) if your oil pressure is below spec?



PS. I'm at work at the moment so I can't look at my manual to check the bypass circuitry. So I don't really know much about what I'm talking about. (So what's new - I hear you say.)

Very astute diagnosis! As soon as he talked about his bypass filter system, I immediately jumped. That oil filter bypass system could well be the cause of his problem.

As for the oil pump bypass, if there was a problem with a weak spring, for example, that would translate into low high pressure, he should still have good idle pressure.

I'm tempted to point the finger at the bypass oil filter system.

EDIT: Well I guess I should have read the rest of the posts before posting what everyone else noticed as well... :whoops:

Glad you got it fixed before it trashed your engine!!!