Step by Silky Step

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Re: Step by Silky Step

Postby RonR » Tue 19.10.2021, 20:29

Thanks for the advice, guys.

The O2 sensor is now in pieces but at least I was able to remove it after breaking the top off. New one is on it's way from Rock Auto.
I tried the extensions / axle stand / breaker bar / jack handle on the crank pulley bolt but no go.
Eventually got the bolt undone using a mains-powered impact wrench, don't know why I didn't try it before!

Had to drill out and re-tap a front disk locating screw today, also found out that the front wheel bearing I installed last year has failed in a few hundred miles.
I bought SKF to ensure quality but it looks like it was a fake.

Note to self - ONLY order bearings from known sources.
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Re: Step by Silky Step

Postby chrisP » Wed 20.10.2021, 16:11

Glad you are making progress Ron

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Re: Step by Silky Step

Postby RonR » Mon 01.11.2021, 19:43

The cylinder head is now off and the steam cleaned top of No.1 piston confirms HGF.
Top_of_block_No1+2.jpg
No.1 piston steam cleaned


The head side of the gasket was the source of the leak - luckily only from water jacket to cylinder.
There's also a mark (yellow arrow) on the head which looks like the fire ring was breached there as well.
Head_fire_seal_leaks_No1.jpg


However I found some corrosion in the head around No.4 cylinder.
Head_corrosion_No4.jpg

The corrosion ends about 2mm from the head gasket fire ring.
I'm not sure whether to get some more material welded in or just leave it - it's taken 29 years to corrode this far - what do you think?
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Re: Step by Silky Step

Postby RonR » Fri 17.12.2021, 19:14

The cylinder head is back from the machine shop. :D
The head was skimmed and new bronze valve guides were fitted, as like Jonathan F I had some corrosion on the leaking cylinder's guides which restricted valve movement.
Also had a 3-angle job done on the seats as they were being re-cut anyway.
The corrosion around No.4 was well away from the fire ring even after skimming, so was left alone.
head-skimmed.jpg
Skimmed


While disconnecting the fuel injectors I managed to break one of the now brittle plastic connectors, due to the clamping spring being almost impossible to release.
I found replacements with springs which are much easier to handle - they'll be crimped AND soldered during the rebuild.
They can be found by putting "TYCO AMP Junior Power Timer 2pin Fuel injector sensor plug" into your favourite auction site search.
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Re: Step by Silky Step

Postby Rambo » Sat 18.12.2021, 09:39

Ron - did you know you had HGF, or suspected you had HGF, before you took the head off? If so, what were your particular symptons?

PS nice shiny head :smt023
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Re: Step by Silky Step

Postby RonR » Sat 18.12.2021, 13:04

Yes Rambo,
I suspected it earlier this year when I had the occasional mysterious loss of coolant and the hoses seemed to be under a bit more pressure than usual. There was no emulsion in the cam cover so I knew oil and water were kept apart.
The clincher was on the way back from CC when I gave it the beans with what was subsequently found to be a stuck wastegate. The turbo over-boosted which I think was the last straw for the gasket.
Next morning the car wasn't happy, misfiring and puffing steam out of the exhaust.
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