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When can you reuse a head gasket?
Posted: Tue May 22, 2018 5:43 pm
by James467
So I had to pull the head back off of DTR's engine but it hasn't been run, the head has simply been torqued down.
I have another gasket but I was looking at the one that I took off and it looks fine.
Could it be re-used?
Re: When can you reuse a head gasket?
Posted: Tue May 22, 2018 6:27 pm
by Mad Mart
Nope. Once the head has been torqued down, that's it.
Re: When can you reuse a head gasket?
Posted: Tue May 22, 2018 11:19 pm
by soe8m
I did it with no problems. Not with a dolomite but in my younger years when I did fit a gasket the wrong way. That engine did run for about 10 minutes before the camshaft started sqreeking. Lifted the head about 3 cm and pulled the gasket in between and fitted it the right way round and torqued down again.
Jeroen
Re: When can you reuse a head gasket?
Posted: Wed May 23, 2018 7:37 am
by tony g
Yes it'll be fine use it. Done it many times, just make sure the oil feed hole seal is not distorted.
Tony
Re: When can you reuse a head gasket?
Posted: Wed May 23, 2018 9:25 am
by cleverusername
James467 wrote: ↑Tue May 22, 2018 5:43 pm
So I had to pull the head back off of DTR's engine but it hasn't been run, the head has simply been torqued down.
I have another gasket but I was looking at the one that I took off and it looks fine.
Could it be re-used?
Do you want to take the risk? It sounds like it would probably be alright, but I would be cautious and fit a new one. You don't want a failure and have to pull the head again.
Re: When can you reuse a head gasket?
Posted: Wed May 23, 2018 9:30 am
by dollyman
I have done it many times FWD bmc cars in order to change the bypass hose's. It was so much easier than fiddling around, and never had a problem
So i would say "yes" as well..... Even more so as it has not been run.
Tony.
Re: When can you reuse a head gasket?
Posted: Wed May 23, 2018 10:07 am
by James467
I will fit a new one just to be sure but I was curious as the one that was on there seemed absolutely fine
Re: When can you reuse a head gasket?
Posted: Thu May 24, 2018 7:49 am
by Magenta Auto Sprint
I always believed that once the flame rings around the cylinders had been compressed that is it, it is not just the gasket sticking to both surfaces that counts.
time versus money for a new gasket etc.
Malcolm
Re: When can you reuse a head gasket?
Posted: Thu May 24, 2018 11:01 am
by SprintMWU773V
Some head gaskets can be used several times but these tend to be MLS type, not what's typically used on a Dolly. Better be safe than sorry and fit a new one.
Re: When can you reuse a head gasket?
Posted: Thu May 24, 2018 3:38 pm
by soe8m
So the non re-users also don't re-torque?
Jeroen
Re: When can you reuse a head gasket?
Posted: Thu May 24, 2018 8:47 pm
by TrustNo1
soe8m wrote: ↑Thu May 24, 2018 3:38 pm
So the non re-users also don't re-torque?
Jeroen
Surely that's not the same as lifting the head off as you are just compressing it more rather than risking separating the material and rings?
Re: When can you reuse a head gasket?
Posted: Fri May 25, 2018 9:42 am
by cleverusername
soe8m wrote: ↑Thu May 24, 2018 3:38 pm
So the non re-users also don't re-torque?
Jeroen
I got curious about this, so did a bit of research. It seems the problem is the type of gasket used on a Dolly is permanently compressed when you fit it, so it conforms to the shape of the head and block. So I am not sure you can remove it and then recompress it, without a risk of failure. I could be wrong. Re-torquing doesn't involve removing it, so would safer.
Copper gaskets seem to be the ones you can reuse, the sort that are fitted to high HP and some racing engines.
Re: When can you reuse a head gasket?
Posted: Fri May 25, 2018 9:49 am
by dollyman
cleverusername wrote: ↑Fri May 25, 2018 9:42 am
soe8m wrote: ↑Thu May 24, 2018 3:38 pm
So the non re-users also don't re-torque?
Jeroen
I got curious about this, so did a bit of research. It seems the problem is the type of gasket used on a Dolly is permanently compressed when you fit it, so it conforms to the shape of the head and block. So I am not sure you can remove it and then recompress it, without a risk of failure. I could be wrong. Re-torquing doesn't involve removing it, so would safer.
Copper gaskets seem to be the ones you can reuse, the sort that are fitted to high HP and some racing engines.
That may be the reason why i never had a failure on old bmc car's, as they were copper
Tony.
Re: When can you reuse a head gasket?
Posted: Sat May 26, 2018 9:22 am
by trackerjack
I think not replacing a head gasket when its off is false economy for so many reasons.
You cannot compare a copper gasket as its not what is fitted to a sprint or any other Triumph.
My old British twin motorbikes and Lambretta scooter were with fitted copper gaskets and I would use a blow torch to heat them up and soften them and then reuse.
As stated dowel the Sprint/1850 & Stag head to the block would cure most of the slants appetite for gaskets.
Re: When can you reuse a head gasket?
Posted: Sat May 26, 2018 10:33 am
by cleverusername
trackerjack wrote: ↑Sat May 26, 2018 9:22 am
I think not replacing a head gasket when its off is false economy for so many reasons.
You cannot compare a copper gasket as its not what is fitted to a sprint or any other Triumph.
My old British twin motorbikes and Lambretta scooter were with fitted copper gaskets and I would use a blow torch to heat them up and soften them and then reuse.
As stated dowel the Sprint/1850 & Stag head to the block would cure most of the slants appetite for gaskets.
The K-series has dowels and it eats gaskets. To be fair they were nasty nylon things, but even metal dowels don't completely solve the problem.
The better fix would be to not use angled head bolts. Isn't that a mod Saab made when they redesigned the slant engine? I don't think Saabs have a rep for blowing heads.