The strangest thing....

Talk about E-Types here
User avatar

Topic author
chrisfell
Posts: 626
Joined: Tue Oct 06, 2009 9:52 am
Location: Salisbury
St Lucia

The strangest thing....

#1

Postby chrisfell » Fri Aug 11, 2017 9:32 pm

....happened today.

Whilst out shopping (for another pot of paint as I'd been commanded to repaint a radiator that had scratches on it) I noticed my engine had started squeaking when cold and at low revs.

Warm, no squeaks. Cold and higher revs, no squeaks.

So back in the garage I waited until the engine was cool again, started it up and listened for where the squeaks were coming from. With a plastic tube I quickly identified the exhaust manifold as the source, where I found nearly half of the brass nuts were loose.

These nuts haven't been touched in years. The loosest were at each end of the engine, the tightest where the two manifolds meet.

All very puzzling.
Chris '67 S1 2+2

Link:
BBcode:
HTML:
Hide post links
Show post links


Durango2k
Posts: 985
Joined: Fri Feb 11, 2011 11:59 pm
Location: Germany
Germany

Re: The strangest thing....

#2

Postby Durango2k » Fri Aug 11, 2017 10:10 pm

Vibrations, vibrations...

Carsten
Jag E '66 S1 2+2, Citroen DS 23 Pallas iE, Citroen SM 3.0, Concept Centaur MK1, Citroen 11 BL '54

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

Series1 Stu
Posts: 303
Joined: Thu Feb 02, 2017 12:26 pm
Location: Shropshire
Great Britain

Re: The strangest thing....

#3

Postby Series1 Stu » Sat Aug 12, 2017 10:54 pm

Durango2k wrote:Vibrations, vibrations...

Carsten


And also

Expansion, contraction, expansion, contraction

Regards
Stuart

If you can't make it work, make it complicated!

'62 FHC - Work In (slow) Progress
'69 Daimler 420 Sovereign
'94 X300 XJR basket case

Link:
BBcode:
HTML:
Hide post links
Show post links


Durango2k
Posts: 985
Joined: Fri Feb 11, 2011 11:59 pm
Location: Germany
Germany

Re: The strangest thing....

#4

Postby Durango2k » Sun Aug 13, 2017 7:45 am

...which is the same but slower :-)

Carsten
Jag E '66 S1 2+2, Citroen DS 23 Pallas iE, Citroen SM 3.0, Concept Centaur MK1, Citroen 11 BL '54

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

Series1 Stu
Posts: 303
Joined: Thu Feb 02, 2017 12:26 pm
Location: Shropshire
Great Britain

Re: The strangest thing....

#5

Postby Series1 Stu » Sun Aug 13, 2017 8:04 am

Ok Carsten, well observed.

Chris,
I assume the manifold nuts are brass but do you have spring washers under the nuts? I suggest you fit some if the studs are long enough, which they often aren't.

Regards
Stuart

If you can't make it work, make it complicated!

'62 FHC - Work In (slow) Progress
'69 Daimler 420 Sovereign
'94 X300 XJR basket case

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

Heuer
Administrator
Posts: 11420
Joined: Sat Mar 01, 2008 5:29 pm
Location: Nottinghamshire
Great Britain

Re: The strangest thing....

#6

Postby Heuer » Sun Aug 13, 2017 10:37 am

Yes, there should be spring washers under the manifold nuts.
David Jones
S1 OTS OSB; S1 FHC ODB

Pin your E-Type to our World Map: https://www.zeemaps.com/map?group=184509

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

Series1 Stu
Posts: 303
Joined: Thu Feb 02, 2017 12:26 pm
Location: Shropshire
Great Britain

Re: The strangest thing....

#7

Postby Series1 Stu » Sun Aug 13, 2017 11:24 am

Back on one of my hobby horses.

Most fasteners should have spring washers fitted. Except for in places like cylinder head studs where the nuts are torqued down to give the requisite tension in the studs.

Regards
Stuart

If you can't make it work, make it complicated!

'62 FHC - Work In (slow) Progress
'69 Daimler 420 Sovereign
'94 X300 XJR basket case

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

Topic author
chrisfell
Posts: 626
Joined: Tue Oct 06, 2009 9:52 am
Location: Salisbury
St Lucia

Re: The strangest thing....

#8

Postby chrisfell » Sun Aug 13, 2017 11:56 am

Everything is as it should be, all studs the correct length including those holding the dip stick clip and the alternator guard, spring washers under brass nuts. My fear is that they haven't come undone, but that the aluminium threads have become soft. I couldn't feel any softness when winding the nuts up again, but I fully expect to have to helicoil one or more of the threads in due course. I know the similar threads in the timing chest cover are already properly stripped, so a session with drills and taps and inserts is planned this winter.
Chris '67 S1 2+2

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

Series1 Stu
Posts: 303
Joined: Thu Feb 02, 2017 12:26 pm
Location: Shropshire
Great Britain

Re: The strangest thing....

#9

Postby Series1 Stu » Sun Aug 13, 2017 3:07 pm

It will be a better job than original if you fit helicoils. We always fit them in aluminium parts if they are considered service items. I suppose it's debatable whether manifold studs should ever need replacement but it is common to unscrew the stud instead of just the nut.

Part of the trouble is that the studs corrode with the presence of heat and moisture and the thread strength is reduced, then it strips.

Regards
Stuart

If you can't make it work, make it complicated!

'62 FHC - Work In (slow) Progress
'69 Daimler 420 Sovereign
'94 X300 XJR basket case

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

Hugo
Posts: 977
Joined: Mon Aug 29, 2016 11:16 am
Location: Horsham West Sussex
Contact:
Great Britain

Re: The strangest thing....

#10

Postby Hugo » Fri Aug 18, 2017 12:24 am

Sort of relevant - I had a coach develop a hydraulic leak where the pipe comes out of the master cylinder. It had been in there quite happily for about fifteen years then one day it decided to start leaking. Weird.
Hugo Miller - rebuilding an imported Series II OTS & converting to RHD

Link:
BBcode:
HTML:
Hide post links
Show post links


Return to “General”

Who is online

Users browsing this forum: No registered users and 3 guests