Jupiter Spark Plug Caps

rickjowett · Post by **rickjowett** » Sat Dec 07, 2019 3:32 am

Can anyone help me find the vintage correct spark plug caps ?

Post by **Forumadmin** » Sun Dec 08, 2019 10:50 am

I have many but they are useless! Any drop of moisture and they arc. But if you want it just for driving around the desert then OK.

Keith Clements · Post by **Keith Clements** » Mon Dec 09, 2019 10:30 am

Happy to offload 4 should you decide you want them as would never use them. You probably also need the fawn seals.

Chris Spencer · Post by **Chris Spencer** » Mon Dec 09, 2019 11:46 pm

Much better to run with NGK right angle motorcycle suppression caps has these carry a waterproof seal at each end and are by far the most reliable cap to run on a Jowett engine

rickjowett · Post by **rickjowett** » Sat Dec 14, 2019 1:40 am

I would like 4 please, in usable and running condition. I think they look so cool, and they are original. How can get 4 ?

rickjowett · Post by **rickjowett** » Sat Dec 14, 2019 1:41 am

What are Fawn Seals ?

Keith Clements · Post by **Keith Clements** » Sun Dec 15, 2019 1:00 pm

Parts list
Sparking Plug Cover Seal Ring 4 x 50859

Keith Clements · Post by **Keith Clements** » Sun Dec 15, 2019 1:06 pm

Hi Rick,
The caps I have are 60 years old and may look 'cool' but IMHO are not 'usable and running condition' for UK conditions. But if you want to give them a try you are welcome to have them on payment of post and packing cost.

Alf Heseltine · Post by **Alf Heseltine** » Sun Dec 15, 2019 8:38 pm

The Jowett spark plug covers can be used to give that finished appearance to the engine. I have used this mod with no
problems. Drill out the covers & insert a suitable modern waterproof cover, I used Honda plug covers as used on the
Rover 827, these are set using a good epoxy into the drilled covers, the job is easy using a cylinder head on the bench.
A soft rubber ring forms an additional seal between the head tin plate & the plug cover, as stated, cool, & correct for
appearance,

Alf

rickjowett · Post by **rickjowett** » Mon Dec 16, 2019 5:13 pm

Hi Alf,

I like your ideas. If possible shoot me a picture of this mod so I can tackle it too.

Rick

Alf Heseltine · Post by **Alf Heseltine** » Wed Dec 18, 2019 9:46 pm

Hi Rick, a couple of pics, might help. Hope you rejoin the club.

Alf.

rickjowett · Post by **rickjowett** » Thu Dec 19, 2019 4:50 pm

Alf,

Thank you. I will try to copy your idea.

Rick

rickjowett · Post by **rickjowett** » Thu Dec 19, 2019 4:52 pm

Forumadmin wrote: ↑Sun Dec 08, 2019 10:50 am I have many but they are useless! Any drop of moisture and they arc. But if you want it just for driving around the desert then OK.

Forumadmin,

I would like your 4 best, please advise on how to proceed. Fawn seals too.

Rick

rickjowett · Post by **rickjowett** » Thu Dec 19, 2019 4:53 pm

Keith Clements wrote: ↑Sun Dec 15, 2019 1:06 pm Hi Rick,
The caps I have are 60 years old and may look 'cool' but IMHO are not 'usable and running condition' for UK conditions. But if you want to give them a try you are welcome to have them on payment of post and packing cost.

Keith,

I would like 4 of your best, fawn seals too. Please advise on how to proceed.

Rick

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