H4 Chassis corrosion?

[flob...@gmail.com]

https://ibb.co/ynK5ZKP
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Recently I thought it was to time to do something with the H4. Charged the battery and it started first time after 18 months standing, quick check over, evicted mouse, cleaned discs and went for MOT. Failed on perished suspension arm rubber, changed arm MOT passed.

Just needs a service and I can start using it; or so I thought until I noticed crack in fibreglass below drivers door. Now I believe the H4 is unsafe and will probably have to be written off. Am I right? Opinions/suggestions please.

Links at top for pics.

[Steve Kodź]

You might be jumping the gun here. I think that area is where the two halves of the fiber glass body are joined. Most H4s have a rubber strip over this join. I only know of a single H4 that had the join smoothed and painted over and that was a white car.

I suspect that may be filler cracking rather than anything more serious.

Regards,

Steve

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[Jim Hearne]

As Steve has said, this is where there is a joint between the body and the floor mouldings.

It is usually covered with a rubber moulding but on your car somebody has filled and painted it.

The joint can be about 10mm wide, see the attached picture.

The question is why is it cracked and bulging out like that.

The steel sill tube on the chassis is behind there but it’s padded out with expanding foam.

 

It could be rust on the steel tube or it could just be a large lump of filler not very well stuck to the fibreglass.

Maybe water has got behind it and frozen pushing the water out.

 

You are going to have to dig out that cracked lump of filler and see whats behind it.

 

Jim

[flob...@gmail.com]

Thanks for the encouraging replies. I did think it was at or near the join and that might be the weak point to fail first. I didn't think about filler and it does look it might be filler. I'll try cutting a small section out asap.

[flob...@gmail.com]

You were all absolutely correct, it was just filler in the gap. I dug some out and i can clearly see the chassis tube painted black with very little surface rust.

Not sure about bridging the gap again with filler.

[Steve Kodź]

That is great news.

Maybe contact Rob Hancock at QSC, as he might have some products that could be recommended.

Regards,
Steve

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[Darren Siepka]

I mix a small amount of gel coat into the chopped strand type filler.

This makes a somewhat easier to sand filler but with proper fiberglass strength.

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