Chevrolet C8 1940 Cab 11 restoration, The Netherlands

[Ganmain Tony]

I agree with the other fella's Alex. Im afraid you'll have to get another one.

This is bloody frustrating and I would be very upset myself having just had it resleeved.

There may be one other option.

If you were to take it to a professional repairer and he was to say he can and will fix it, then I think you would be OK to proceed with a repair job - providing the professional does the work.

I suppose then it is a matter of cost - if the repair is as much or nearly as much as replacement - well then, go with replacement.

[cletrac (RIP)]

I think it could be repaired. It's been sleeved so there's no danger of it leaking pressure. You'd have to use a zip disc to cut the crack wider then thread the bolt in and braze it up.

[Alex van de Wetering]

Guys,

Thanks for all your comments. It was a mix of bad luck and stupidity. I thought I had partly unscrewed the stud myself when removing the master cylinder from the truck, so I never thought that screwing it back would cause this result. An expensive lesson. On checking my pics from before removing the thing I noticed the stud was already sticking out too far, so either it came from the factory like that or it happened somewhere during it's career. Anyway, there was some black sludge in the hole....a bit mud-like. As I say....next time I will definately take the time to clean the hole and thread.

I agree with all you guys.....can it be fixed?....I think so, but I would definately ask a professional shop in stead of trying myself. Is there a risk?....I think so, even though the sleeve is pretty much a closed chamber as Dave noted. The risk of it cracking again or warping during the treatment is present, so even if it can be properly welded, it could prove more expensive to get everything sorted again than to have another cylinder sleeved...
Most of all, even if It was fixed properly, I wouldn't be sitting comfortably on my way to Normandy!

So, the only sensible thing seems to be to cut my losses, look for another Master cylinder, or at least the casting, have it sleeved in Stainless again and do the same procedure again......well, without the cracking hopefully.

thanks for the feedback guys, much appreciated!
Alex

[Lynn Eades]

Alex, it is a good lesson for us all. The gunk in the hole develops a high pressure (just like a hydraulic ram)when the stud is screwed in against it. It was probably thick enough to seal, rather than exiting down the thread.
Some guys would never say anything. We learn the fastest, when we make mistakes. When we see the mistakes of others, sometimes the warning can penetrate our own skulls. (me included)

[Alex van de Wetering]

Guys, The reach of MLU is amazing. I was offered a replacement master cylinder from a fellow C8 owner. The funny thing is that he is not on MLU as far as I know, but he did read about my master cylinder disaster. The replacement cylinder is now on it's way to get sleeved. Thanks Guido!

It's about time to update the log. Attached are some pics of the rear cab supports. One needed some work as the steel suffered a lot from the contact moist held by the wooden spacer which is sandwiched between these supports and the cab floor itself.

Alex

[Alex van de Wetering]

Some more pics of the supports and a sneak preview of the new wooden spacers.

Alex

[Bob Carriere]

Hi Alex

What ever hard wood you use as replacement make sure that the wood has been soaked in a oil base paint for the first one ro two coats than full strenght paint for a top coat...... takecare to insure that paint has soaked into every bolt holes.

I have literally encapsulated my wood using POR 15...... the finished product is very resistant to abrasion ) rubbing of floor and bracket).

In the original design as the wood got wet it decays and generates tanic acid that will other wise rust a bolt shaft to a perfect hour glass shape.

Keep up the good work.

Bob C