Lotus Elan

Head bolts

PostPost by: wobblyweb » Mon May 11, 2020 7:21 pm

Hi, I am looking for a couple of old head bolts to make into head alignment studs.
Anyone have any in the UK for sale?

Thank you
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PostPost by: danielmo » Tue May 12, 2020 2:42 am

Why don’t you just get some long 7/16” course thread bolts and cut off the heads? Slot the top so you can screw them out when you’re finished.
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PostPost by: ericbushby » Tue May 12, 2020 7:26 am

A pair of used bolt would be ideal but I could not find any.
I did as Danielmo says, but could not find bolts long enough.
I drilled and tapped what I could get, in the lathe and araldited a thinner screwed rod in to extend them.
Best of luck
Eric in Burnley
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PostPost by: alan.barker » Tue May 12, 2020 8:45 am

Use Stud bar :wink: :wink:
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PostPost by: ericbushby » Tue May 12, 2020 11:37 am

Yes Alan, you are right, £8.35 on ebay for enough bar for two guides.
For some reason I could not find that at the time.
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PostPost by: wobblyweb » Tue May 12, 2020 11:41 am

Great ideas thank you, I hadn't thought about making them.
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PostPost by: 2cams70 » Tue May 12, 2020 11:52 am

I used a piece of 10mm nylon rod to make head locators. Much better than sawn off head studs because the nylon is soft so there is no risk of scoring or scratching the head face during fitment. Tap a 7/16" UNC thread on one end and cut a screwdriver slot on the other. I made them fairly short because I found the head difficult to fit over the timing chain tensioner pad if the locators are too long. I also tapped a small thread into the slotted end so I could easily pull them out with a piece of threaded rod even though they were cut short. You can purchase nylon rod cheaply on Ebay.
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PostPost by: patrics » Sat May 16, 2020 10:27 pm

Hi,
I have some used bolts, will have a look tomorrow and turn the bolt head down to same diameter as shaft.

Regards
Steve
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PostPost by: patrics » Sun May 17, 2020 10:09 pm

Hi,
Attached should be an image - didn’t take long.
Need to put a slot in - if I get chance tomorrow, I will try with my angle grinder.

Regards
Steve
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PostPost by: alan.barker » Mon May 18, 2020 5:28 am

For the Slot put 2 Blades in your Hacksaw at the same time. That will cut a Slot in the end just the right width
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PostPost by: patrics » Tue May 19, 2020 9:53 am

Hi Alan,
two blades is a good idea and probably the most reliable - still want to use my angle grinder!

Regards
Steve
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PostPost by: 2cams70 » Tue May 19, 2020 10:30 am

I'd be interested to hear how you go fitting the head with full length guidance studs. My experience is that you can't because of the length and angle the timing chain damper pad sits above the face of the timing chest. The head has to be angled during fitment to clear the damper pad which you cant do with full length studs. Perhaps the damper pads you buy these days are a different length to original.
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PostPost by: alan.barker » Tue May 19, 2020 1:42 pm

Also on the Elan Sprint you can touch the starter solenoid with the back of the Cylinder Head.
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PostPost by: rgh0 » Wed May 20, 2020 10:09 am

I put one guide stud in the rear right and then slide the head down and over the chain guide and put another guide stud in the left front. to hold alignment of gasket, block and head. Check that the two studs you use do achieve good gasket alignment with the actual gasket you are using

I then lift the head a little to fit the rubber drain tube and then start fitting the rest of the head bolts or studs.

cheers
Rohan
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PostPost by: Elanintheforest » Wed May 20, 2020 10:26 am

2cams70 wrote:I'd be interested to hear how you go fitting the head with full length guidance studs. My experience is that you can't because of the length and angle the timing chain damper pad sits above the face of the timing chest. The head has to be angled during fitment to clear the damper pad which you cant do with full length studs. Perhaps the damper pads you buy these days are a different length to original.


I've not had a problem with my cut-down studs, fitting the head to the short motor when in place in a Lotus Cortina, and building the engine up completely out of the car for my Elan.

I like the idea of lifting the head slightly to pop the rubber tube in place as I mucked it up with my Lotus Cortina trying to do it all at once, which dripped oil liberally when it ran up. I thought that I would have to lift the head to replace it, but when the new tube arrived from Paul Matty, it was so pliant it could be fitted in-situ. The QED tube was very stiff.

I now lower the head onto the short motor using the engine crane! No need to hurry because the muscles are giving up, and everything can be checked a few times as it goes down very slowly.
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