68 replies to this topic

[yel327]

GMH did move the PCV to the opposite rocker cover when they moved the oil filler. I’ve always assumed it is so the PCV didn’t get drowned. You have the front timing case filler though so that shouldn’t be an issue.

[gtrboyy]

Run hoses from the 2 rocker covers & timing cover to decent sized catchcan...if engine is pressurizing or excessive blowby you'll notice for sure by catchcan.

 

Later on issues are sorted out you can to take breather filters off catchcan fit pcv to top of it & run hose to aircleaner base.Most of us here only do that for rego or defect clearance.

 

Modulator could be leaking & sucking oil also.

 

Might not be one specific thing but a combination of small things but those seem like the obvious to start on.

 

** engine builders have found dipsticks to show incorrect levels from factory...aftermarket even worse.

[Zook]

LS it mate. It's like a 308 but without the hassles. I've got one in a Holden commercial.

[LJ RB30]

Looks like you have way to much oil going to the rockers & are probably swamping the valve guides.

 

Here is my 253, hard to video clearly but you can see the rockers have oil sitting on them.

 

The motor has GM hardened base lifters & stock push rods.

 

Hope the links work.

 

 

[kavesh]

Thanks LJ,, your video worked and confirmed for me that I have too much oil coming to the top. Unlike your motor I have oil pooling in my rocker covers.

 

Maybe I need to remove the 3mm shim in the oil pump, that may just be making this problem worse.(just remembered I did that).

LS it mate. It's like a 308 but without the hassles. I've got one in a Holden commercial.

 

 

lol, if you happy to sponsor the LS......if only I could man

[kavesh]

Run hoses from the 2 rocker covers & timing cover to decent sized catchcan...if engine is pressurizing or excessive blowby you'll notice for sure by catchcan.

 

Later on issues are sorted out you can to take breather filters off catchcan fit pcv to top of it & run hose to aircleaner base.Most of us here only do that for rego or defect clearance.

 

Modulator could be leaking & sucking oil also.

 

Might not be one specific thing but a combination of small things but those seem like the obvious to start on.

 

** engine builders have found dipsticks to show incorrect levels from factory...aftermarket even worse.

 

Thanks man, but after seeing that video of Lj's 253 I am now more convinced that there is too much oil going to the top that needs to be addressed somehow.

What was the reason for pushrods being sold with restricted holes om them and valve lifters as well with restricted holes. Was that for race application or street driven vehicles as well?

[gtrboyy]

Roll pins were to restrict oil to top end.

 

As you can see early heads aren't the best for oil drainage although that problem is usually at high rpm modded engines.

 

What is actual oil pressure at idle?

 

Must be high to pool up in heads at idle & doesn't look like draining that well either.Should see it splashing a little bit.

[kavesh]

Looks like you have way to much oil going to the rockers & are probably swamping the valve guides.

 

Here is my 253, hard to video clearly but you can see the rockers have oil sitting on them.

 

The motor has GM hardened base lifters & stock push rods.

 

Hope the links work.

 

 

 

LJ,I want to confirm with you on your motor whether you have those restricted pushrods or lifters that restrict oil flow?

Just want to make sure I have all my bases covered here.

[LJ RB30]

No restrictors in pushrods at all. The lifters are standard GM Holden hardened base lifters (was told they were only used in 186S & 304 V8's but don't know for sure). Not sure if they are restricted in flow anymore than a normal lifter but they came in a GM boxes & unmodified when fitted.

[ls2lxhatch]

How many litres of oil have you put in the engine and what viscosity did you use?

[kavesh]

No restrictors in pushrods at all. The lifters are standard GM Holden hardened base lifters (was told they were only used in 186S & 304 V8's but don't know for sure). Not sure if they are restricted in flow anymore than a normal lifter but they came in a GM boxes & unmodified when fitted.

 

Thanks LJ.

 

I am thinking luck of the draw with my lifters. Also GM ., with harden base as well. Somehow my lifters are just sending oil upstairs to flood the rockers.

I am thinking of looking for rollpins to restrict flow on my motor. Saw another video of a 308  with the cap off and the inside rocker looks exactly as yours does. 

How many litres of oil have you put in the engine and what viscosity did you use?

 

4.5-4.7 litres SAE40 monograde to run in the motor

[LJ RB30]

Though I haven’t tried myself but have heard of the roll pin method many times & I think would be the quickest & cheapest thing to try in your situation.

[Bigfella237]

What is your actual oil pressure reading?

 

You may be treating the symptom not the cause.

[ls2lxhatch]

I suspect the 40W oil is adding to the problem. When the engine is cold you will have high oil pressure and slow drain back from the heads.

[kavesh]

Though I haven’t tried myself but have heard of the roll pin method many times & I think would be the quickest & cheapest thing to try in your situation.

 

So today i bought 2.5mm by 30mm long roll pins and hammered them into the pushrods. With this I was feeling rather optimistic. How wrong was I, there was still a lot of oil up there sadly.

 

I am not sure whether it makes a difference if the pushrod is installed with the rollpin against the lifter In my case I had the roll pin end of the pushrod facing the rockers. 

 

At idle i used a screwdriver to establish how much oil is pooling in there and it measured about 10mm

[kavesh]

Here is the link to the video, https://youtu.be/p16t8kxNPbw

[kavesh]

I suspect the 40W oil is adding to the problem. When the engine is cold you will have high oil pressure and slow drain back from the heads.

 

Oil pressure is quote high when cold. On first startup with choke on it would read just over 2 bars and if I gave it a gentle rev over 4 bars.

 

This is meant to be my run in oil and would change to maybe a 15w40 or 20w50. What are you guys using?

[LJ RB30]

Yep that's still a shit load of oil :-(

[LXCHEV]

Just some interesting reading that you may or may not be interested in:

 

https://www.aussiev8...ins-oiling.html

 

http://www.gmh-toran...iction-for-308/

 

 

[gtrboyy]

Roll pins & small orifice lifters etc were high rpm issues of oil pooling in the heads not necessarily needed at idle.

 

Stock blueprinred pump or hi-vol aftermarket?

 

You shimmed spring or measured it?

 

Really need to put a decent oil pressure gauge on it.

 

What is 2 bars in psi?

 

Obviously not 10-20psi if pooling like that.

[yel327]

2 bar is close to 30psi.

[S pack]

I would be checking the oil drain holes in the heads are not partially obstructed by the head gaskets.

[kavesh]

Roll pins & small orifice lifters etc were high rpm issues of oil pooling in the heads not necessarily needed at idle.

 

Stock blueprinred pump or hi-vol aftermarket?

 

You shimmed spring or measured it?

 

Really need to put a decent oil pressure gauge on it.

 

What is 2 bars in psi?

 

Obviously not 10-20psi if pooling like that.

 

I have the stock oil pump with a 3mm shim for the spring. I have done the mods to the pump per the AussieV8 thread. 

[kavesh]

I would be checking the oil drain holes in the heads are not partially obstructed by the head gaskets.

 

The drain back holes are clear, but I will check to confirm that the gasket is not blocking drainage.

[rexy]

Do you mean Bar as in the pressure measurement unit? 1 Bar = 1 x atmospheric pressure = 14 psi.

 

Or do you mean bar as in your oil pressure gauge has a number of bars representing the scale?