Head bolt leak?

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Head bolt leak?

Post by kapri » Mon Jul 23, 2018 1:26 pm

I've had quite afew Essex V6 powered car sthrough the years plus using them in one offs. However the problem on my Scimitar engine is a first for me . I know of , and have experienced the V6 reputation for blowing head gaskets . This one appears to be leaking UP the head bolt . Bits removed from engine so I can't run it at the moment so an ideal moment to sort if anyone is aware of the cause and cure ?

I know that particular bolt ,nearest the exhaust manifold is right next to a waterway but does it actually pass INTO the water channel ? If so I'm hoping thread sealer will resolve it , however if it's crack between bolt hole and water channel it all becomes a bit more challenging .

I'm hoping to run compression chceks tonight to see if there any indications of a head gasket issue and I also have a CO2 dye test for checking once it's back up and running.



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Head bolt leak?

Post by philhoward » Mon Jul 23, 2018 1:50 pm

None of the head bolts pass through a waterway that I know of. I’ve seen it creep up the inlet manifold bolts through a leaking gasket but not the way you describe.


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Head bolt leak?

Post by Coupe Racing » Mon Jul 23, 2018 1:57 pm

If in the past the engine had work carried out and some fluid was left in the bolt hole where the head bolt fits , then the replacing of the bolt can cause a hydraulic fracturing in the area


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Head bolt leak?

Post by kapri » Mon Jul 23, 2018 11:40 pm

Strange results from comp test . All showing 11bar except ( as expected) the two either side of the leaking head bolt which were at 9 bar dry. Did a wet test and the immediately increased to 11 bar . However despite cranking over for a fair time to clear the oil it was still showing increased readings 3 hours later ?

I'm wondering if the oil has been pushed up and temporarily sealed a small head gasket issue ?



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Head bolt leak?

Post by philhoward » Tue Jul 24, 2018 7:15 am

If there is a small crack/leak then the oil will probably have sealed it and without the heat and higher cylinder pressures from running it may well stay there giving the seal?


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Head bolt leak?

Post by Coupe Racing » Tue Jul 24, 2018 7:42 am

Have you checked the torque of the head bolts


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Head bolt leak?

Post by kapri » Tue Jul 24, 2018 10:50 am

Ni, I've not checkd the torque yet as there is a load of 'gunge' stuck all round the head bolt that's obviously been slowing the flow at least . I'm goingto recheck suspect cylinders again this morning and go from there .

Does anyone know if you can dye test water for co2 after it hasn't run for awhile or does it disappate from the water if left ?



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Head bolt leak?

Post by kapri » Tue Jul 24, 2018 10:52 am

philhoward wrote:
Tue Jul 24, 2018 7:15 am
If there is a small crack/leak then the oil will probably have sealed it and without the heat and higher cylinder pressures from running it may well stay there giving the seal?
Which gives me hope for a quick K Seal temp repair until I get more time. :)



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Head bolt leak?

Post by scimjim » Tue Jul 24, 2018 10:59 am

Co2 will dissipate. Why not whip the heads off while it’s out?


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Head bolt leak?

Post by kapri » Tue Jul 24, 2018 2:02 pm

Engines still in situ at mo .



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Head bolt leak?

Post by scimjim » Tue Jul 24, 2018 5:30 pm

Sorry, I must have misread your first post - comment stands though, I’d whip the heads off to check.


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Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
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1300 SS1 (Number One) & Sarah's coupe.
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Head bolt leak?

Post by kapri » Tue Jul 24, 2018 9:51 pm

24 hours since last test and reading still holding up as normal matched to all other cylinders?

Unfortunately For health reasons everything takes far longer than it should and I need to use the car locally on teh 10th of August so can't risk stopping it running currently . I've ordered a head set to do it properly later.

In my prime heads would have been off checked and back on easily in a day , now an old hours work takes me a day :(



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Head bolt leak?

Post by scimjim » Tue Jul 24, 2018 10:48 pm

Understood - if it’s holding pressure I’d just check torque the bolts then - 90lbft, not the 70 quoted in the books.


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1300 SS1 (Number One) & Sarah's coupe.
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Head bolt leak?

Post by Coupe Racing » Wed Jul 25, 2018 5:59 am

Hope the headset isn’t an EBay special
Reinz gaskets or FoMoCo gaskets are best and mean you are unlikely to do the job twice !!


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Head bolt leak?

Post by kapri » Wed Jul 25, 2018 8:22 pm

Well it's up an running with a temp gauge reading of 130C on an unpressurised system ;)

This has had a different engine fitted and could be from Granada / capri or similar. Does anyone know the correct part number for the temp sender Reliant us eplease ?



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