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 Posted: 04-29-2015 06:29 am
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Frank Schwartz
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 I think I may be forgetting things.... Our JH was leaking coolant from under the radiator cap when the engine came up to temp. I think this one is rated too high for the car...I looked in the service manual and could not find the specs for the cap. Can anyone tell me what is the correct pound rating for a new cap??

Thanks
Frank
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 Posted: 04-29-2015 08:58 pm
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Frank Schwartz
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 Hmmmm...I see 25 people viewed this inquiry and not a single one of you had an answer...shame on you, fellow Jensenites....
Frank Schwartz
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 Posted: 04-29-2015 09:15 pm
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answerman
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 I can look at my cap tonight (assuming it's marked) if no one gets you an answer in the meantime. I can't guarantee mine is the original cap, though.
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 Posted: 04-29-2015 11:29 pm
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Jim Ketcham
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 Sorry. Missed this one.
The cooling system is rated at just 10 psi (as per shop manual).
The OEM radiator cap was 7 PSI.

I noticed most vehicles I've seen are running 13 psi caps. I believe it's because the 7 psi caps are harder to find.
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 Posted: 04-30-2015 12:05 am
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Jensen Healey
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 Thanks Jim. My caps are 13 and 16lbs. I didn't want to post erroneous information again.

Kurt
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 Posted: 04-30-2015 12:47 am
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Frank Schwartz
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 7 pounds? Really? Are you absolutely sure? I mean, really, really sure?

If so, where can I find that information?

Thanks
Frank
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 Posted: 04-30-2015 01:54 am
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Jensen Healey
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 Hi Frank, page 7 of the shop manual states the cooling system is rated for 10PSI.

I see RockAuto UK sells the 7# cap for the JH.

MotoRad which makes aftermarket caps specifies the ST7, a 7# cap with safety lever for the JH. http://www.motoradusa.com/motorad_catalog.cml?catalog=MotoRad&year=1974&make=Jensen&model=Healey&engine=2.0L+4Cyl+L+%281973%29
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 Posted: 04-30-2015 05:11 am
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Frank Schwartz
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 I understand...the book does say 10 pounds, but I have yet to find where anywhere it states that the radiator cap is of any pounds...and none of are sure, I think, of what really came on the car...I am still looking..and in the parts book, it is merely shown as part #92013...which is ?????
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 Posted: 04-30-2015 04:50 pm
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Jensen Healey
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 I feel that the manufacturer of radiator caps doesn't sell just any cap for the JH. They sell the 7# cap. They have liability if they sell the incorrect cap and it causes an injury.
Have you called Mike at Delta?

Cheers, Kurt
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 Posted: 04-30-2015 04:51 pm
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Jim Ketcham
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 Frank,
7 psi cap is what came from the factory with the car. I am sure since I bought the car new in 1974.
You would not want a cap with a pressure rating higher than the systems as it would not protect the system. Think of it as a fuse.

Mine has always been 7 psi and it has never blown coolant yet.
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 Posted: 04-30-2015 11:26 pm
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Frank Schwartz
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 Thanks, Jim...that is what I needed to find out..someone with an original cap ...so off tot he car parts store for 7psi cap..

Thank you,
Frank
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 Posted: 11-15-2015 05:05 pm
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Kees
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 The original cap on my UK spec car was 9lbs. They cap to be used should be 10lbs. ~!5lbs is regarded as safe for the cooling system.
I run my car at 86 degrees C and zero pressure because of a suspected head gasket failure more than a year ago, no problems, no coolant loss whatsoever.
Kees Oudesluijs
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