Javascript Disabled Detected

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

6 Cylinder yellow terra heads

Started by _bryceck_ , Jul 02 2021 10:28 AM

Please log in to reply

9 replies to this topic

#1 _bryceck_

Guests

Posted 02 July 2021 - 10:28 AM

Has anyone had problems with oil not draining quick enough on yellow terra cast iron heads. Push rod clearance is very small. The problem I have is on 186 in LJ Torana when engine is working, IE on HWY doing 100 KLM, oil comes out of engine breather on tappet cover.

Thanks Chris

Back to top

#2 73SUNBURSTEXYOUWON

Forum Fixture

Members
807 posts

Name:JASO
Location:Brisbane
Car:4/73 LJ XU-1. Adelaide build, Sunburst. 1963 EH Premier. Brisbane build, Portsea Blue.
Joined: 14-June 12

View Garage

Posted 02 July 2021 - 08:18 PM

That sounds like blowby, maybe compression pressue is holding the oil up.

Where else is oil coming out? Dipstick tube?
How is the PCV?

How is the bottom end of this engine, piston rings?

Years ago, i had a similar issue as i describe above, and the old engine I had (202), when pulled down had Broken Rings.

Back to top

#3 claysummers

Lotsa Posts!

Members
3,318 posts

Name:Clay
Location:Willunga
Car:186 FB Ute, 3.3 EK sedan
Joined: 13-December 18

Posted 02 July 2021 - 10:08 PM

Yella Terra cast iron heads are reworked factory Holden heads. Nothing done to pushrod holes.

Sent from my iPad using Tapatalk

Back to top

#4 warrenm

Forum Fixture

Members
2,105 posts

Location:Central West NSW
Car:1972 LJ Torana
Joined: 08-November 05

View Garage

Posted 02 July 2021 - 11:46 PM

What rocker cover are you using?

Back to top

#5 I'm a Red Motor fiend

Forum Fixture

Members
758 posts

Name:Adam
Location:Nairne SA
Car:LJ 4 door, LC GTR
Joined: 04-January 16

View Garage

Posted 03 July 2021 - 05:58 AM

Drill the push rod holes out and run guide plates.
Drill out the drain backs and open up as well.
If your running a HV oil pump, don't. That will be the problem.
Or as Warren is eluding to, your rocker cover is not baffled or you do have excess blowby as stated.

Back to top

#6 _bryceck_

Guests

Posted 07 July 2021 - 07:06 AM

Hi Guy's, Thanks to all replies.

The oil pump is standard, the engine is in perfect condition, IE no blow by from rings, no bottom end problems, has not done many KLM since complete rebuild.

The tappet cover is a chrome plated cover. The engine has Roller Rockers, Also has triple SU carburetors.

The reply about drilling push rod holes to bigger diameter as well as oil drain holes in head, I have heard of this but don't know specifics, If anyone has done this, is it posable to get more info on doing this to head IE hole sizes etc.

Thanks Chris

Back to top

#7 jd lj

Forum Fixture

Members
2,100 posts

Name:James D
Location:in the shed
Car:LJ SVO
Joined: 03-December 10

Posted 07 July 2021 - 09:15 AM

Is it a chromed gmh rocker cover or an after market one. Most after market covers are very poorly baffled if at all.

Back to top

#8 I'm a Red Motor fiend

Forum Fixture

Members
758 posts

Name:Adam
Location:Nairne SA
Car:LJ 4 door, LC GTR
Joined: 04-January 16

View Garage

Posted 07 July 2021 - 01:41 PM

It's gotta be lack of baffles in the rocker cover then.

Back to top

#9 Dr Terry

Technical + Numbers Guru + Moderator

Moderators
3,276 posts

Location:Eastwood (Sydney) NSW
Joined: 13-November 05

Posted 07 July 2021 - 03:41 PM

I notice the mention of "triple SU carburettors".

If that is the case how is the PCV set up & how much idle vacuum does the engine pull.

Dr Terry

Back to top

#10 _bryceck_

Guests

Posted 07 July 2021 - 05:02 PM

Hi Guy's, The chrome tappet cover is I think after market, IE there are no baffles in proximity of breather on tappet cover, [ point where oil is put into engine ]. There is a baffle where PVC valve is. On that point, PCV pick up is on front and rear carby's, middle carb is vacuum for distributor. Vacuum at idle, would have to check.

Chris