4/98NT engine blowing water out through the fill cap

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4/98NT engine blowing water out through the fill cap

Post #1 by jcb1968 » Sat Jan 29, 2011 6:31 pm

3cx with the leyland 4/98nt engine, blowing water out through the filling cap on top of the engine,
any ideas what is causing this?
the temp gauge is starting to rise from 40/50 to 80/90 and cools down again at tick over. though i topped up with 1litre of water

New radiator and water pump fitted last month, as the fan had broken off and busted the orginal radiator
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Re: 4/98NT engine blowing water out through the fill cap

Post #2 by newjcb123uk » Sat Jan 29, 2011 9:28 pm

Typical Head gasket gone by the sounds of it - Not major surgery but certain protocols have to be adhered to to ensure success. Worst case is a cracked block. Hope this helps.
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Re: 4/98NT engine blowing water out through the fill cap

Post #3 by essexpete » Sat Jan 29, 2011 9:47 pm

Agree with head gasket. It might pay to give the head a little overhaul whilst off and ideally take it to someone that can check that it is not out of true or cracked. I would also have the radiator out for a proper clean and flush. I am sure that head gasket problem we had years ago was down to a dirty rad that was noy obvious on cursory inspection.


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Re: 4/98NT engine blowing water out through the fill cap

Post #4 by TEZB » Sat Jan 29, 2011 11:54 pm

look for oil in water also as these engine's are prone to cracked and porous liner's

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Re: 4/98NT engine blowing water out through the fill cap

Post #5 by FOWLER MAN » Sun Jan 30, 2011 12:28 am

Check the liner protrusion too.
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Re: 4/98NT engine blowing water out through the fill cap

Post #6 by LuisM » Mon Feb 21, 2011 6:52 pm

I had a minor leak on my 3DII after new cylinder head gasket.

Check the small m8 bots between cylinder head cover and cylinder head. They use to be drilled all through the cylinder head to the water chamber. If sealant is not used when mounting the cover, water can leak throug the bolts into the top of cilinder head.

I am very bad explaining but for sure you are better understanding than me explaining.

Yours,

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Re: 4/98NT engine blowing water out through the fill cap

Post #7 by jcb1968 » Tue Apr 26, 2011 5:18 pm

Hi all,
just got the head back on, skimmed and pressure tested
however straight away the cooling system is pushing up out through the fill cap again, and engine overheats
oil is ok
is this a cracked block?
how do i fix, or should i buy a complete doner engine?
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Re: 4/98NT engine blowing water out through the fill cap

Post #8 by martyn williams » Tue Apr 26, 2011 5:55 pm

First thing, have you let the water level settle down.. You may have over filled it. If its not that,you may have cracked block. There are firms around the UK that offer a recon short block.I think I have seen a company in tractor and machinery.Check that the radiator is not blocked.I had same symptom on a Perkins 4108.The rad was bunged up with leaves.Get that checked first as its a cheaper option.
Good luck
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Re: 4/98NT engine blowing water out through the fill cap

Post #9 by jcb1968 » Tue Apr 26, 2011 10:32 pm

Just found the following and my engine has the thermostat removed
http://leyland.conforums.com/index.cgi?board=general&action=print&num=1249737200
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Re: 4/98NT engine blowing water out through the fill cap

Post #10 by essexpete » Tue Apr 26, 2011 11:58 pm

Ah you bin on the farming forum anall. :wave:


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