Lotus Elan

TC cylinderhead bolts/guide studs

PostPost by: Mrozik » Sat Feb 27, 2021 5:54 am

Does anyone in the UK have two old cylinderhead bolts that I could have so I can convert them to guide studs or tell me where I can buy them?
Thanks
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PostPost by: UAB807F » Sat Feb 27, 2021 6:57 am

If you don't get any offers for old studs, I normally use plain round bar cut to length.

It doesn't have to be screwed tightly into the block, just fit well enough that it doesn't rock about. Then I find the head goes where you want it to and the gaskets stay in place.

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PostPost by: ericbushby » Sat Feb 27, 2021 8:37 am

God morning,
I have two suggestions,
You can get a yard of 7/16 UNC studding on ebay for about £12.00.
Although I do appreciate that the reduced diameter of an old head bolt makes it a bit easier.
If you have the facilities, you could make them by drilling and tapping the thread part of an old screw and extending it with a smaller diameter piece of studding, which is what I did.
Eric in Burnley
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PostPost by: 2cams70 » Sat Feb 27, 2021 12:06 pm

Much better than metal studs is 10mm nylon rod from EBay. Cut to length and use a 7/16” tap on the end to make a thread. No risk of scratching the underside of the head with these unlike using old head bolts or lengths of threaded steel rod
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PostPost by: Elan45 » Sat Feb 27, 2021 2:39 pm

I made my temp studs from brass rod and threaded the end w/ a die. I also cut a screwdriver slot in the opposite end and also put a slight taper on that end too. I like the idea of a plastic stud.

Roger
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PostPost by: RichardHawkins » Sat Feb 27, 2021 7:08 pm

Mrozik,

I am pretty sure I have som old studs if you still need them. I can check tomorrow, I have just had wine with my evening meal and have also opened a beer so don’t think I want to get dirty this evening.

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PostPost by: Billmack » Sat Feb 27, 2021 8:35 pm

If you use cut off bolts they will be hard to extract. Go the route of threaded rod or just plain 3/8 round stock will get you close enough.
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PostPost by: Billmack » Sat Feb 27, 2021 8:40 pm

If you use cut off bolts they will be hard to extract. Go the route of threaded rod or just plain 3/8 round stock will get you close enough.Ive even used a big Phillips head screwdriver from the top side. Sorry about the two posts at once. I'm new
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PostPost by: Mrozik » Sun Feb 28, 2021 1:05 pm

Thanks for everyone for the suggestions - I decided to go for the 3/8 rod solution - cost £3.64 delivered :)
John
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PostPost by: 1owner69Elan » Sun Feb 28, 2021 4:17 pm

Something to consider if you ever have major engine work done is to have locating dowels machined into the head and block. That’s what I have. Obviously need a shop that does precision work.
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