Coolant leaking at inlet manifold, screwing everything, 1.8 carb

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Chazwozza
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Coolant leaking at inlet manifold, screwing everything, 1.8 carb

Postby Chazwozza » Wed Jun 28, 2017 2:52 pm

Heya, I've got an '88 Scala which is fitted with the 1.8 Carb. It's still using the original pierburgh carb, which up until now has been pretty fine.

Anyway, I've just had quite a catastrophic failure. Basically, the coolant tube running under the inlet manifold has sprung a leak, which then drips coolant down onto the exhaust manifold. This then boils, causing much steam. It also seems to be getting into the exhaust somehow, causing steam out the exhaust.

I don't know quite how, but this also seems to have f***ed the idle, which is now varying from non-existent to far too low. I assume there is some mechanical way in which the carb is controlled via this water temperature, which is now obviously ruined?

Anyway, has anyone experience anything like this? Do I just use generic coolant hose for that area? Is an exact width important? Apologies for my ignorance on the subject, but not an area I've ever had an issue before.

Thanks for any help



mark1gls
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Location: Somerset

Re: Coolant leaking at inlet manifold, screwing everything, 1.8 carb

Postby mark1gls » Thu Jun 29, 2017 10:36 am

There is a small rubber grommet which the coolant from the head runs into the inlet manifold, the rubber goes hard and brittle over time and breaks.
That could be your problem?

You will need to remove the inlet manifold to replace the rubber grommet and fit a new gasket.

http://www.ebay.co.uk/itm/VW-GOLF-MK1-C ... nrusI0TsGw


Fixing your coolant leak will hopefully solve the running/idle problem.


Mk1 78 Scirocco GLS 1.6 FR, weekend toy.
Mk1 88 Golf GTi cabriolet 1.8 DX. Daily drive.
Membership No. 323

Chazwozza
Posts: 16
Joined: Thu Jun 02, 2016 11:23 pm
fill in the right answer: 15
Location: Oxford

Re: Coolant leaking at inlet manifold, screwing everything, 1.8 carb

Postby Chazwozza » Thu Jun 29, 2017 4:50 pm

mark1gls wrote:There is a small rubber grommet which the coolant from the head runs into the inlet manifold, the rubber goes hard and brittle over time and breaks.
That could be your problem?

You will need to remove the inlet manifold to replace the rubber grommet and fit a new gasket.

http://www.ebay.co.uk/itm/VW-GOLF-MK1-C ... nrusI0TsGw


Fixing your coolant leak will hopefully solve the running/idle problem.


Thanks, was not aware of that grommet, definitely coming from that area though. I'll give it a go.



Chazwozza
Posts: 16
Joined: Thu Jun 02, 2016 11:23 pm
fill in the right answer: 15
Location: Oxford

Re: Coolant leaking at inlet manifold, screwing everything, 1.8 carb

Postby Chazwozza » Fri Jul 14, 2017 5:44 pm

Just to be thorough:

The issue is now resolved, the rubber grommet mentioned above was indeed compromised and the seal more generally wasn't looking good. What's more, one of the inlet manifold bolts and two of the exhaust manifold nuts had disappeared. This obviously contributed to the leak, but also explains why there was steam coming out the exhaust at the rear.

Can also confirm, as said elsewhere on the forum, that it is just about possible to remove the inlet manifold in situ, but it is incredibly difficult. In hindsight it may have just been quicker to take the entire head out.

Thanks for the help mark1gls



mark1gls
Posts: 2485
Joined: Thu Apr 02, 2009 9:28 pm
fill in the right answer: 10
Location: Somerset

Re: Coolant leaking at inlet manifold, screwing everything, 1.8 carb

Postby mark1gls » Sun Jul 16, 2017 9:23 pm

Glad to hear it's fixed and thanks for the update. :-)


Mk1 78 Scirocco GLS 1.6 FR, weekend toy.
Mk1 88 Golf GTi cabriolet 1.8 DX. Daily drive.
Membership No. 323


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