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Re: blown head gasket :eek: [Re: shaggy] #747374
April 16th 2019 4:49 am
April 16th 2019 4:49 am
Joined: Apr 2004
Posts: 1,790
Ireland
shaggy Offline OP
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shaggy  Offline OP
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Ireland
There are similar radiator stop leak products here but not those tablets mainly liquid ones likes Wynns or Lucas. Seeing as I've done a lot of other engine dress up work and put new radiator fans on it might be time to treat my van to a new radiator. I can get this one delivered for €130 / €115 seems good value.

https://www.ebay.ie/itm/NEW-RADIATOR-FIT-CHEVY-GMC-G30-G20-G10-SAVANA-G1500-G2500-G3500-1706/192568937868?hash=item2cd600cd8c:g:KJYAAOSw9mpZ5orz


79 chevy G30 cobra camper conversion.
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Re: blown head gasket :eek: [Re: shaggy] #747375
April 16th 2019 4:50 am
April 16th 2019 4:50 am
Joined: Apr 2004
Posts: 1,790
Ireland
shaggy Offline OP
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shaggy  Offline OP
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Just thinking though, if the leak was in the radiator there would be no reason for the drained coolant to have an oil glaze on it.


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: blown head gasket :eek: [Re: shaggy] #747408
April 16th 2019 11:36 pm
April 16th 2019 11:36 pm
Joined: Sep 2005
Posts: 8,838
Nuya
C
CatFish Offline
carpal tunnel
CatFish  Offline
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Nuya
I think you're right about it seeping coolant into the lifter galley.
Stock radiators usually have a trans cooler built into them. But any exchange of fluid there would show up pretty quick on the trans dipstick.
Have the heads been resurfaced or the block decked by chance? Cutting the block or heads lowers them in relation to the manifold and can cause a mismatch at the intake mating surface. But something like that is usually accompanied by a vacuum leak. Anyway, did the intake bolts line up and screw in okay without a hassle? Do you have any oil seepage at the front or rear of the intake?
Maybe the gaskets just slipped a little. It does seem odd that a relatively new set of gaskets would leak coolant but not leak vacuum.
LIke you said, just thinking out loud here.

Last edited by CatFish; April 16th 2019 11:39 pm. Reason: kant spel
Re: blown head gasket :eek: [Re: shaggy] #747410
April 17th 2019 1:45 am
April 17th 2019 1:45 am
Joined: Apr 2010
Posts: 2,689
San Diego
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wrcsixeight Offline
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The new radiator you linked, the picture appears to show connections for a tranny fluid cooler in one side tank and an engine oil cooler in the other plastic side tank, though the description says it only has the ATF cooler.

Does your existing radiator have an engine oil cooler?

Might be the source of the sheen, if so. If not, could be the tranny cooler leaking into the coolant.

If you have an older copper brass radiator, well lets say the plastic tanked aluminum models are not really built to last. If there are still shops In Ireland than can recore radiators there, they might be a better option. Seems all those shops around here have been killed off by 70$ chinesium radiators.

Regarding the stop leak products. I've read nothing good about any, but the crushed gingerroot tabs I posted a pic of, and these might be responsible for my heater core not transferring heat as it once did.

Re: blown head gasket :eek: [Re: shaggy] #747724
April 27th 2019 5:37 am
April 27th 2019 5:37 am
Joined: Apr 2004
Posts: 1,790
Ireland
shaggy Offline OP
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shaggy  Offline OP
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Current radiator only has the trans cooler so it's unlikely to be caused by that as Catfish said. I'll hold off on a new radiator but maybe send it out to be re-cored over the winter when I take the van out of use. Everything is still pointing to the inlet manifold gasket. It don't remember any issue with bolts lining up but it may be just a small failure in the gasket.


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: blown head gasket :eek: [Re: shaggy] #749123
May 31st 2019 2:33 pm
May 31st 2019 2:33 pm
Joined: Apr 2004
Posts: 1,790
Ireland
shaggy Offline OP
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shaggy  Offline OP
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Ireland
So finally got round to doing a leak down test and all cylinders came up as good.

Rocker covers are covered in emulsion on the top so it looks as though water is getting past the inlet manifold gasket at one of the water jacket holes , dripping down into the sump and being sprayed up with oil through the push rods to coat the inside tops of the rocker covers. Gonna pull the inlet manifold and investigate that next week.


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: blown head gasket :eek: [Re: shaggy] #749138
May 31st 2019 8:24 pm
May 31st 2019 8:24 pm
Joined: Mar 2011
Posts: 348
NY
J
jcd74 Offline
enthusiast
jcd74  Offline
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NY
Remember next set gaskets, it's regular maintenance to check the bolts. When new,check after warm up, check at end of day, check in a couple days, check couple weeks, check twice a year. Yup it's a chevy, don't forget the header bolts.

Re: blown head gasket :eek: [Re: shaggy] #749201
June 03rd 2019 2:15 pm
June 03rd 2019 2:15 pm
Joined: Apr 2004
Posts: 1,790
Ireland
shaggy Offline OP
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shaggy  Offline OP
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Will do, cheers JCD74


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: blown head gasket :eek: [Re: shaggy] #752543
September 18th 2019 9:09 am
September 18th 2019 9:09 am
Joined: Apr 2004
Posts: 1,790
Ireland
shaggy Offline OP
veteran
shaggy  Offline OP
veteran
Joined: Apr 2004
Posts: 1,790
Ireland
So I've changed the inlet manifold gasket and replaced the radiator. The problem still persists but no issues with any cylinders misfiring or running issues so I still don't think it is getting into the cylinders.
Still want to cover other possibilities before taking the heads off.
Can water get into the oil without getting into the cylinders due to a bad head gasket?
Is there any other water to oil interchange point I should be looking at?
There is no oil cooler built into the rad just a tranny cooler, but is there an oil cooler built into the block on an SBC?


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: blown head gasket :eek: [Re: shaggy] #752545
September 18th 2019 10:43 am
September 18th 2019 10:43 am
Joined: Nov 2013
Posts: 1,238
West Texas
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Wedgy Offline
old hand
Wedgy  Offline
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Posts: 1,238
West Texas
Originally Posted by shaggy
So I've changed the inlet manifold gasket and replaced the radiator. The problem still persists but no issues with any cylinders misfiring or running issues so I still don't think it is getting into the cylinders.
Still want to cover other possibilities before taking the heads off.
Can water get into the oil without getting into the cylinders due to a bad head gasket?
Is there any other water to oil interchange point I should be looking at?
There is no oil cooler built into the rad just a tranny cooler, but is there an oil cooler built into the block on an SBC?


Hi Shaggy,

1. Yes. 2. Not positive, but, I don't think so. 3. No.
Unfortunately, If there is water mixing with the oil, or oil mixing with the coolant...

That motor is so clean, I wouldn't want to have to go that deep either Mate, but.

I still enjoy needling Leonard about my "Rebuilt" 327 shocked

Plus. William of Ockham came up with that pesky theory called Occam's razor.

Cheers! and Good Wrenching!

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