The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
It is currently Mon May 28, 2018 5:21 am

All times are UTC




Post new topic  Reply to topic  [ 11 posts ] 
Author Message
PostPosted: Sat May 12, 2018 6:27 am 
Offline
TDC Member
User avatar

Joined: Sun Aug 14, 2011 2:47 am
Posts: 310
Location: NSW. Australia
I'm looking for advice on what tension a Sprint head should/could be torqued down to......and I understand 55lbs/ft is the recommended tension.

Before you answer, I need to tell you that three weeks ago, this car had an overheating issue due to an electric fan failing, in slow moving traffic, while climbing a mountain.
After eventually finding a spot to pull over and upon stopping the engine, it boiled, and left traces of coolant that had escaped between the head and block, directly under the inlet manifold and around the area of cylinders 2 & 3. There is no water in the oil, nor oil in the coolant.

The electric cooling fan has been repaired and works as it should and the car is still running fine. But on one run since then, there was just the slightest/tiniest evidence of a coolant seep in that area.

In an effort to stop any further leak without going to the trouble and expense of removing the head, I'm about to re-tension it and would like to know if there's a safe maximum, beyond the 55lbs ft.
Should this fail to stop any further seepage of coolant, then I'll have to bite the bullet and import all the necessary gaskets, machine the head, etc, etc.

Thanks & Cheers,
Rob

_________________
"When everything seems to be going against you, remember that the airplane takes off against the wind, not with it". HENRY FORD
1915 Ford "T" Speedster (Evangeline), 1921 Ford "T" Tourer (Anastasia), 1955 Zephyr 6 (Purdey), 1975 Dolomite SPRINT (Daisy), & a couple of moderns.
Member #2018011


Top
   
PostPosted: Sat May 12, 2018 7:52 am 
Offline
TDC Member
User avatar

Joined: Fri Oct 06, 2006 8:57 am
Posts: 519
Location: Auckland, New Zealand
Don't know the history of your car, but you MAY find this is simpler to fix than you think.

Yes I would try retorquing first. I've never gone beyond 58ft lb, even on the racecar with an overskimmed head, and use the standard sequence in the manual. I lightly oil the threads or use copper grease if necessary, never dry. However how accurate is your torque wrench, especially if it hasn't been checked recently?

If it is just coolant to the outside, there is always the chance a 'stop leak' type product might work.

If that doesn't work make sure you order a Payen gasket set (I get mine from Rimmers and order a couple so I always have a spare, just in case!). Unless the head is warped, and I doubt it is from what you say, I suspect if you clean the surfaces up, especially where the leak is, you'll be alright with just a gasket change. I also spray the gasket lightly with VHT high temperature Copper Gasket Cement on both faces before assembling (I would have got that from either Repco or Supercheap).

There is only so many times a Sprint head can be skimmed and there are no more new ones, so I would only do that if there was no alternative. The minimum head height from the factory is supposed to be 120.5mm, measured from the cam journal to main face. If you measure yours when/if you take if off, you'll get an idea of how much has been skimmed off to date.

Let us know how you get on.

Geoff


Top
   
 Post subject: Okay........
PostPosted: Sat May 12, 2018 8:27 am 
Offline
TDC Member
User avatar

Joined: Thu Aug 09, 2007 12:22 pm
Posts: 6218
Location: Caithness, Scotland
The torque figures quoted in the BL manual are for the threads oiled.
(If you use copper grease then you will over tighten.....)


If it was me, I would take the head off and replace the gasket.




Ian.

_________________
TDC Forum moderator
PLEASE help us to maintain a friendly forum,
either PM or use Report Post if you see anything you are unhappy with. Thanks.


Top
   
PostPosted: Sat May 12, 2018 1:07 pm 
Offline
TDC Member
User avatar

Joined: Tue Oct 03, 2006 4:48 pm
Posts: 7842
Location: Weston-super-Mare, England
I torque them to 60 lbs ft. 58 is the minimum I would use.

_________________
Sprintless for the first time in 35+ years. :boggle2:

2007 Porsche Boxster S


Image

Grammar:
The difference between knowing your sh#t and knowing you're sh#t.

Schedule: Pronounced "Shedule" not "Scedule"!


Top
   
PostPosted: Sat May 12, 2018 5:20 pm 
Offline
TDC Member
User avatar

Joined: Sat Apr 12, 2014 10:02 pm
Posts: 1991
Location: Nr Kenilworth
58 to 60 lb/ft here too. re-torque studs first one undone and redone etc. Middle then outer then outer then outer. Then the bolts in the same sequence. Typically I have seen the nuts and bolts rotate just shy of 30 degrees each (from an initial torque as stated above). Good luck.

Tony

_________________
Membership 2014047


Top
   
PostPosted: Sat May 12, 2018 5:52 pm 
Offline
TDC West Mids Area Organiser
User avatar

Joined: Thu Sep 28, 2006 12:13 pm
Posts: 11677
Location: Over here...can't you see me?
On the basis all you have to lose by re-torquing is time (if it is unsuccessful) then I would try this procedure first, even if you do so whilst awaiting for gaskets to arrive.

If it is successful, then I'm sure having some gaskets ready on continent will be no inconvenience to you, or others, in the future!


Top
   
PostPosted: Sat May 12, 2018 10:12 pm 
Offline
TDC Member
User avatar

Joined: Sun Aug 14, 2011 2:47 am
Posts: 310
Location: NSW. Australia
Gentlemen,
Thank you all for your advice.
We have some bad weather here at present, so we'll get onto the task sometime during the week.
I'll report back as we progress.
Thanks again,
Rob

Edit,
PS; Knowing that......
1) "Coolant" will find a way between surfaces where "water" wont.
2) I live in an area with only a few light frosts each winter.
3) Apart from this problem, the cooling system in the Sprint is in A1 top condition......
I am prepared to change the Anti boil, anti freeze, anti corrosion "coolant" to a decent corrosion inhibitor only. Should you feel that this might be a good option, what do you think of this, locally available product ?...... https://www.penriteoil.com.au/assets/pi ... OOLANT.pdf

_________________
"When everything seems to be going against you, remember that the airplane takes off against the wind, not with it". HENRY FORD
1915 Ford "T" Speedster (Evangeline), 1921 Ford "T" Tourer (Anastasia), 1955 Zephyr 6 (Purdey), 1975 Dolomite SPRINT (Daisy), & a couple of moderns.
Member #2018011


Top
   
PostPosted: Sat May 12, 2018 11:02 pm 
Offline
Future Club member hopefully!
Future Club member hopefully!

Joined: Mon Dec 03, 2012 6:04 pm
Posts: 800
Quote:
Gentlemen,
Thank you all for your advice.
We have some bad weather here at present, so we'll get onto the task sometime during the week.
I'll report back as we progress.
Thanks again,
Rob

Edit,
PS; Knowing that......
1) "Coolant" will find a way between surfaces where "water" wont.
2) I live in an area with only a few light frosts each winter.
3) Apart from this problem, the cooling system in the Sprint is in A1 top condition......
I am prepared to change the Anti boil, anti freeze, anti corrosion "coolant" to a decent corrosion inhibitor only. Should you feel that this might be a good option, what do you think of this, locally available product ?...... https://www.penriteoil.com.au/assets/pi ... OOLANT.pdf
That only thing that gives me pause is it compatible with an alloy head? Alloy head without an aluminium friendly inhibitor will dissolve if left long enough.


Top
   
PostPosted: Sun May 13, 2018 12:02 am 
Offline
TDC Member
User avatar

Joined: Sun Aug 14, 2011 2:47 am
Posts: 310
Location: NSW. Australia
OK, here are 2 others from the same manufacturer, for your comments please......
https://www.penriteoil.com.au/assets/pi ... NTRATE.pdf
https://www.penriteoil.com.au/assets/pi ... IBITOR.pdf
Rob

_________________
"When everything seems to be going against you, remember that the airplane takes off against the wind, not with it". HENRY FORD
1915 Ford "T" Speedster (Evangeline), 1921 Ford "T" Tourer (Anastasia), 1955 Zephyr 6 (Purdey), 1975 Dolomite SPRINT (Daisy), & a couple of moderns.
Member #2018011


Top
   
PostPosted: Sun May 13, 2018 11:19 am 
Offline
TDC Member
User avatar

Joined: Fri Oct 06, 2006 8:57 am
Posts: 519
Location: Auckland, New Zealand
Sounds like a good option to me, given that is what I have done in the Auckland climate.

I would ring or email Penrite Technical and Cutomer Service Centre up and ask them direct. I have found them very helpful when I've contacted them about product (oil) suitability. Otherwise there is the RedLine's 'WaterWetter' and that I can vouch for. You may have to order that though (GL Lubricants Pty Ltd., 4/364 Park Road, Regents Park, NSW, 2143, +61 02 9645 1806)

Geoff


Top
   
PostPosted: Tue May 15, 2018 11:36 am 
Offline
TDC Member
User avatar

Joined: Sun Aug 14, 2011 2:47 am
Posts: 310
Location: NSW. Australia
Today we re-tensioned the head.
It appears that when the head was replaced last time, it hadn't been re-tensioned after its initial install.
One by one, we noted the tension of each and the location of the wrench, then cracked the bolts undone. They were all around 45-50lbs/ft, but are now evenly re-torqued down to 60lbs/ft.

And that reminds me of a question I've been meaning to ask for several years.....
What's with the angled head studs and bolts? I assume there's a reason for it, but I haven't got a clue as to why its designed this way. Someone, please enlighten me.

Again, Thanks to all of you who answered this thread with advice. Its very much appreciated.

Cheers,
Rob

_________________
"When everything seems to be going against you, remember that the airplane takes off against the wind, not with it". HENRY FORD
1915 Ford "T" Speedster (Evangeline), 1921 Ford "T" Tourer (Anastasia), 1955 Zephyr 6 (Purdey), 1975 Dolomite SPRINT (Daisy), & a couple of moderns.
Member #2018011


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 11 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Limited