Barksavon
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| posted on 6/7/13 at 08:15 AM |
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Pinto Headbolts
Ive got a 2litre Pinto in my Avon the engine came out of a G registered Transit which i think is 1988. The headgasket which has been fitted for about
3 years has gone and was letting water into no 2 cylinder, no massive signs of gasket failure though. I dont know whether i need to fit new headbolts,
can anyone post photos of the difference between the torx head and the 12 point splined head bolts. Burton Power sell the latter on e bay, they say
they are not to be confused with the Torx Stretch bolts
Thanks
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Mikef
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| posted on 6/7/13 at 08:45 AM |
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they defn need replacing , I use Reinz, from Matt lewis, also use a Reinz head gasket. Do remember that there is a reason it has gone and whilst it
is all off I would defn have it skimmed, only needs a fraction , you then know its perfect. Reinz have a good section on their web site of head gasket
failures and the reasons they go, worth a look.
My son went through this last year with his westfield , did not get it skimmed ( Looks fine to me dad ), first trackday bang , another lot of head
bolts and gasket plus a skimming.
Not sure about the bolts . I think the non stretch are the older ones , I have always used the torx ones on my Pinto , but that what it came with.
MikeF
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britishtrident
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| posted on 6/7/13 at 10:00 AM |
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Unless the head has been removed and replaced half a dozen times or the bolts grossly over tightened No you don't need to fit new head bolts it
is a common misconception. The only reason why stretch bolts are fitted to most recent engines is because they are assembled by robotic lines, it
is easier to get a robot to accurately tighten a bolt to a specified angle than a specified torque. The bolts are only tightened beyond the elastic
limit a tiny amount by the initial tightening this dosen't make the bolts weaker or greatly change the mechanical properties except to increase
the the elastic limit of the bolt in tension very slightly.
The spline bolts have fine pitched splines while Torx bolts are coarse 6 pointed stars.
However you do need to find out why the head gasket failed, back in the 1970s and 1980s although we looked after a large number of Cortinas and
Transits I never encountered a single Pinto head gasket failure. We did replaced dozens of camshafts and a few engines due to piston problems but
not one single cylnderhead gasket.
Keep in mind that it may not be a cylinder head gasket it could be a water leak into number 2 cylinder from the inlet manifold gasket or it could
be a crack in the cylinder head.
I would also look at the layout of the cooling system and check the engine has a by-pass flow when the thermostat is closed.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Barksavon
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| posted on 7/7/13 at 09:55 AM |
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Thanks for the replies. Ive had a good look at the inlet manifold and there's no sign of a failure allowing water into the inlet port of no
2cylinder as i would expect to see, ive also filled the head with water to see if i could see any sign of water seeping through any crack into no 2
but nothing (appreciate the head was stone cold when i did this) but no obvious signs of anything and no sign of how the water was getting in to no 2
so ive got to assume gasket failure
Two differing views on the replacement of the head bolts...it will have to be a judgement call on my part re that then
Thanks Again
Ian
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