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 Post subject: Re: Blown head gasket
PostPosted: Fri Oct 11, 2019 3:39 pm 
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Joined: Tue Oct 30, 2012 8:32 pm
Posts: 105
tuffxf wrote:
Most of the headgasket failures i see on these are caused by tuneup issues, too much timing or too lean.
The engine detonates , only 4 headstuds, head lifts slightly and so begins the end of the gasket.
The spark plugs usually tell the story in this case.
What gaskets? Retorqed or not?
Bolts or studs, what lube? What torque?
Cheers

I got the cylinder head off today and the head gasket was blown on #7 in towards the lifter valley #6 was eroded on the fire ring but wasn't far behind the heads were put together with ford bolts and were not retorqued it appears the heads of the bolts were not lubed. The head gasket appears not to have a number on it look to have been black and has many very little dimples across the surface of it. If this was a lean event would the next step be to reassemble with a new head gasket and address the carb issue ? would the other head gasket need to be replaced ? Looks like the gasket has a number of 543926 on it and a thickness of .050.


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 Post subject: Re: Blown head gasket
PostPosted: Fri Oct 11, 2019 9:02 pm 
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Joined: Wed Oct 31, 2012 4:57 am
Posts: 200
G,day,
Bit hard to say over the net,
I would pull the other head whilst you are at this stage, I would change both.
if it was a mild combo 400 hp or so I'd use the std felpro gaskets that come in the kit, above that I like the 1013's.
I'd have to look for the torque specs, I haven't used bolts for years, but they will be fine if you torque then properly,
You also need to retorque them properly! ie back each bolt off in turn and in sequence and pull them up in one go smoothly,
make sure it is cold, release the pressure cap and drop the coolant out first.
in my opinion you do not want it running at 200 all the time, 180 - 190 max, use a 170 -180 t/stat and make sure you have a ample sized and properly set up cooling system.
As far as whether it is lean or not you need to figure that out, you could have too much timing who knows.
Do you have the ability to read the plugs or a wideband to get an idea?
They did update the torque specs a little over here for the ho engines with bolts, I can get those specs if you want.
You talked about swapping to avgas, did you read what I said earlier?
Cheers


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 Post subject: Re: Blown head gasket
PostPosted: Sat Oct 12, 2019 11:39 am 
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Joined: Tue Oct 30, 2012 8:32 pm
Posts: 105
https://i.ibb.co/PWQP86w/IMG-3359.jpg Seeing if this posted


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 Post subject: Re: Blown head gasket
PostPosted: Sat Oct 12, 2019 5:27 pm 
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Joined: Wed Oct 31, 2012 4:57 am
Posts: 200
Looks like a composition gasket, nothing flash!

With aluminium heads especially you need to make sure the head and block surface where the gasket blew has no dips or grooves or it will go again.
Cheers


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 Post subject: Re: Blown head gasket
PostPosted: Sat Oct 12, 2019 7:42 pm 
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Joined: Tue Oct 30, 2012 8:32 pm
Posts: 105
Tuffxf, there wasn't any erosion on the head or block imgbb is a good place to host pics Ill try to put up a few more I believe you are right about the going lean with the change over to the 100LL fuel. Im going to pull the motor and fix a leaking rear mail seal and have Brent look into a new cam that will be a little more street friendly the current cam is over .700 lift and not needed.


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 Post subject: Re: Blown head gasket
PostPosted: Sat Oct 12, 2019 8:14 pm 
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Joined: Wed Oct 31, 2012 4:57 am
Posts: 200
Cool! Brent will sort you out.
Cheers


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 Post subject: Re: Blown head gasket
PostPosted: Sun Oct 13, 2019 4:16 pm 
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Posts: 105
https://i.ibb.co/CntBMbM/IMG-3363.jpghttps Does anyone recognize this gasket


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 Post subject: Re: Blown head gasket
PostPosted: Sun Oct 13, 2019 4:18 pm 
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Joined: Tue Oct 30, 2012 8:32 pm
Posts: 105
https://i.ibb.co/RcG3bRp/IMG-3360.jpg Lucky I shut it down immediately


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 Post subject: Re: Blown head gasket
PostPosted: Sun Oct 13, 2019 4:20 pm 
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Joined: Tue Oct 30, 2012 8:32 pm
Posts: 105
https://i.ibb.co/8cLmSLQ/IMG-3361.jpg


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 Post subject: Re: Blown head gasket
PostPosted: Sun Oct 13, 2019 4:26 pm 
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Joined: Mon Oct 29, 2012 2:49 pm
Posts: 639
Location: Orange County, NC
Hard to tell, but kinda looks like a cheap Mr Gasket that comes with their rebuild kits.

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