Lotus Elan

Head bolt retorque

PostPost by: oldelanman » Fri Mar 15, 2019 7:23 pm

What procedure do you use to retorque the head bolts ... back off and retorque each bolt in the sequence or loosen them all and then retorque in sequence ?
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PostPost by: types26/36 » Fri Mar 15, 2019 7:33 pm

oldelanman wrote: "back off and retorque each bolt in the sequence"
This!
------------------------------------------------------------------
Definitely NOT this!
"loosen them all and then retorque in sequence ?"
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PostPost by: oldelanman » Sat Mar 16, 2019 7:02 am

Thanks Brian.
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PostPost by: alan.barker » Sat Mar 16, 2019 7:09 am

In 45 years of tinkering on Twinks when fitting the Head i have always Torqued down in 3 stages.
I have never ever retorqued a Head and have had no problems.
Maybe i have been very lucky :roll: who knows :?
For sure many people like to retorque and it could be a personal choice.
Did Lotus retorque Heads or call Cars back to the Dealers to retorque after a few miles :?:
Imho i can't remember them doing that.
Alan
ps For sure Twinks used in Competition is a different ball game :mrgreen:
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PostPost by: oldelanman » Sat Mar 16, 2019 8:14 am

I've never re-torqued before either ... hence my question on how to go about it.
Only considering doing it now as I have a small oil leak appeared on the LHS where the head, block and front cover join.
It's most likely the cork gasket I suspect so pulling down the head probably wouldn't help anyway but I thought it may be worth a try.
I used RTV on the cork gasket last time and it has squeezed out a fair bit .. have always used Hylomar in the past and not had this problem.
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PostPost by: alan.barker » Sat Mar 16, 2019 8:43 am

I have always found that the Cork Gaskets seem to move after a while.
Maybe Glueing the Cork Gasket in place before fitting the Head would help.
Rohan is the Expert for this.
Alan
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PostPost by: types26/36 » Sat Mar 16, 2019 10:23 am

Lotus said to check the head bolts on the initial 500 mile service, I can only presume that meant to re-torque them.
I have always done it on lots of engines I have worked on and never had a blown gasket.
I normally loose them approx a quarter of a turn just enough to “break the torque lock” then retighten to specs.
This is done ONE AT A TIME in the tightening sequence.
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head-bolts.jpg and
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PostPost by: alan.barker » Sat Mar 16, 2019 10:41 am

Thanks Brian,
is that just an internal Doc because printed on the left is " not to be redistributed" :?
Could you say what Doc that is please
Alan
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PostPost by: types26/36 » Sat Mar 16, 2019 1:01 pm

alan.barker wrote: is that just an internal Doc because printed on the left is " not to be redistributed" :? Could you say what Doc that is please Alan

No its not an internal document, it’s the original S1/2 official workshop manual supplied by Lotus.
The “not to be redistributed” warning is on every page presumably to stop people coping and selling it.
Attachments
1.jpg and
2.jpg and
3.jpg and
4.jpg and
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PostPost by: oldelanman » Sat Mar 16, 2019 1:41 pm

It's also in the later Workshop Manual ... never noticed that before :oops:

I will be checking mine then - if ever I reach 500ml since the last time the head was off :roll:

Thanks again Brian.


extract-from-manual.jpg and
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PostPost by: alan.barker » Sat Mar 16, 2019 2:58 pm

Thanks again Brian,
for pointing that out Workshop Manuel Section "O" page 3. O.2 FREE SERVICE (500 miles). :oops:
Maybe it was a little late when i bought my Sprint as it had already 69,500 miles on the clock :lol: .
I hope the first owner Terry Tozer at Tollgate Engineering (Lotus Dealer) followed the Lotus Elan Workshop Manual :mrgreen: :mrgreen:
Also Saint Miles who changed the Chassis and used to service the Sprint :wink: :wink:
Alan
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PostPost by: types26/36 » Sat Mar 16, 2019 5:11 pm

types26/36 wrote:I normally loose them approx a quarter of a turn just enough to “break the torque lock” then retighten to specs.This is done ONE AT A TIME in the tightening sequence.

Oh :roll: and forgot to mention only do the retighting when the engine is stone cold although I'm sure you already know that Roger........................grandmother sucking eggs blah blah blah.......
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