rad caps passing.?

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rad caps passing.?

Post by simmo116 on Sun Nov 24, 2013 11:11 am

Hi guys while topping up the mystery machine this morning I noticed that when I squeeze the fat coolant pipe to expelled air I get air bubbles into the expansion tank. Is this ok. I'm guessing not. Oh and engine is cold.

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Re: rad caps passing.?

Post by HighlyJetted on Sun Nov 24, 2013 11:33 am

My guess would be that the cap isn't holding any pressure.

Replace it as they are only like £5 from a motor factor.

But make sure the fitting where the cap sits is good, scrape it out with a screwdriver to get rid of the mass of rusty crap, then I use a little rotary wire brush in a drill to clean it up after that. What your looking to form is a nice seal between the rubbers and the metal of the fitting, but 90% of them are such a mess that a new cap wouldn't seal with out cleaning it up.
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Re: rad caps passing.?

Post by simmo116 on Sun Nov 24, 2013 1:42 pm

Think that's why it was purging into the expansion tank and over heating. Noticed pipe work is all pitted. Are they easy to come by? If rusted to much.
Thanx HJ

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Re: rad caps passing.?

Post by HighlyJetted on Sun Nov 24, 2013 4:04 pm

I normally have a couple of sets of pipes, but have sold out this week Sad
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Re: rad caps passing.?

Post by simmo116 on Sun Nov 24, 2013 4:22 pm

I'll see what it's like once cleaned up.

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