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nustad12
coolant leaking from rear a12 engine
#1
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hi all, I have coolant leaking out between gear box and engine(a12) no coolant in oil, heater hose ok has any one got any ideas only leaks when engine running

Posted on: 2014/1/19 7:54
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anths
Re: coolant leaking from rear a12 engine
#2
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welch plug in the back of the block,probably leaks as the coolant system heats up and expands,pull the motor and replace all your welch plugs because the rest wont be too far behind
cheers anthony

Posted on: 2014/1/19 8:14
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lamb_daiquiri
Re: coolant leaking from rear a12 engine
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There's a coolant welch plug back there. Could be that.

Posted on: 2014/1/19 8:16
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nustad12
Re: coolant leaking from rear a12 engine
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all dry around welsh plug

Posted on: 2014/1/19 8:53
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Re: coolant leaking from rear a12 engine
#5
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Any coolant stains back there? You should be able to see the white stains. Is the heater outlet at back of head leaking from head?

Posted on: 2014/1/19 9:36
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nustad12
Re: coolant leaking from rear a12 engine
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heater hoses are at front of engine there are no stains

Posted on: 2014/1/19 10:02
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anths
Re: coolant leaking from rear a12 engine
#7
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as unfamilia said heater outlet,block welch plug (not cam plug)head welch plug or head gasket at the back of the block is the drip central or to one side,perhaps run some coolant in the water to help trace it

Posted on: 2014/1/19 10:07
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ddgonzal
Re: coolant leaking from rear a12 engine
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There is a welch plug on the back of the block. You
can't see it until the FLYWHEEL is removed.

Posted on: 2014/1/19 11:03
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datsunbeginner
Re: coolant leaking from rear a12 engine
#9
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There should also be a heater tap in the back of the head with a heater hose running to it unless someone bypassed your heating system.

Posted on: 2014/1/19 12:05
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uteboy1200
Re: coolant leaking from rear a12 engine
#10
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coolant leaking out between gear box and engine

I have same problem(a15 though) but there is oil mixed in. Was thinkin it could be gearbox main bearing.

Only leaks 50-100mls of each when parked.

Posted on: 2014/1/20 6:58
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