what do i look for???

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mgbloke
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what do i look for???

Post by mgbloke » Wed Sep 13, 2017 2:36 pm

Hi all,

Ive been having some issues with my TA heads!.
Have had another engine refresh ( well rebuild actually new pistons, rings and rebore) another new M248 cam.

The car drives fine on the road but when I hit the track this happens:-


It is exactly the same problem that I had before and never found because of other issues (long story).

It seems to be No 5 cylinder. Have had stem seals done twice so don't think it is that. visual inspection shows nothing.
Fine on startup with no sign of smoke.

Ideas anyone?

Cheers

Mark



mgbloke
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Post by mgbloke » Wed Sep 13, 2017 6:26 pm

I have just spotted that the oil return holes from the head are half blocked by the head gasket. The TA head must have the drain back in a slightly different place. (heads still fitted)
Its not going to cause the problem but must cause oil to pool in the head.

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Coops
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Post by Coops » Thu Sep 14, 2017 5:28 pm

hi mate,
I'm running TA Heads with no issues,
Breather issue?
how do you know its no5? the plug oiling up???
Regards Tony C (COOPS)
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MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
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mgbloke
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Post by mgbloke » Thu Sep 14, 2017 8:34 pm

Yes no 5 plug oily as hell.
Have you the same issue with head gasket blocking oilways.
look down the hole with covers off.

I will take heads off at weekend to investigate.

how is yours running?

cheers

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Coops
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Post by Coops » Fri Sep 15, 2017 6:05 am

Yeah mine blocks the oil flow back holes but only by a little 3/4 hole clear.
I run the TA roller rockers and pushrods on mine too (doubt makes any difference regarding your problem)
Mines running real sweet to be honest.

Have you a cracked head at all??
Regards Tony C (COOPS)
Image
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
New Forged 4.8 V8 kitted out with the dogs Cajones of parts and a procharger D1SC. 2017 :D
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk

BISH V8
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Post by BISH V8 » Sat Sep 16, 2017 12:06 pm

And here's the answer..


Current project
1972 mgb v8 4.6 roadster

mgbloke
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Post by mgbloke » Sat Sep 16, 2017 3:42 pm

Yes, the problem has been identified.
No5 inlet pushrod hole is slightly offset and when I cleaned the casting flash up I accidentally left the wall wafer thin resulting in a hole.
hopefully it is repairable with some ally welding.

ooops!

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stevieturbo
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Post by stevieturbo » Sat Sep 16, 2017 8:31 pm

If cleaned up, even a good epoxy might be an option ?

Sleeve the PR hole ?

or as you say a little welding, or some of that cold welding type stuff.

Always some sort of solution.
9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0

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Coops
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Post by Coops » Sun Sep 17, 2017 8:58 pm

thin sleeve in the pushrod hole?
Regards Tony C (COOPS)
Image
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
New Forged 4.8 V8 kitted out with the dogs Cajones of parts and a procharger D1SC. 2017 :D
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk

mgbloke
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Post by mgbloke » Mon Sep 18, 2017 9:28 am

Thanks guys,

Local engineering shop are fitting a sleeve to the pushrod hole.

cheers.

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Coops
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Post by Coops » Mon Sep 18, 2017 11:17 am

nice one mate good luck
Regards Tony C (COOPS)
Image
MS2 V3.57 Ecu mapable efi and wasted spark ignition.
Rotrex C38-91 supercharger and Cossie RS500 Intercooler @ 14psi of Boost. 404 RWHP, (4.6)
New Forged 4.8 V8 kitted out with the dogs Cajones of parts and a procharger D1SC. 2017 :D
Sponsored by: www.v8performanceparts.co.uk, www.interpart.biz, www.caprisport.com & www.baileyperformance.co.uk

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