Author Topic: Manifolds and blanking plates  (Read 102 times)

Fergus

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Manifolds and blanking plates
« on: 24 June 2020, 11:32 AM »
Hello Colleagues I took the car to have the manifolds changed and to sort out a minor oil leak.

The replacement manifolds appear to have fitted in well (pic 1 and 2 ) but the mechanic told me that the oil leaks appeared to be coming from the blanking plates on the side of the block. Is this a common occurrence and would replacing the plates address the problem? I appreciate there might be issues behind the plates.

Cheers

Fergus

UTn_boy

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Re: Manifolds and blanking plates
« Reply #1 on: 24 June 2020, 02:22 PM »
I'm seriously questioning your mechanics knowledge and abilities at the moment, as well as his ethics.   There is no oil behind these plates.  These plates cover up cooling passages for the engine cooling system of the engine block.  So if they were leaking they'd be leaking antifreeze, not oil.  Where you're leaking oil is likely from the mating surface of the top of the cylinder head and the bottom of the camshaft housing.  If not, then it could also be the head gasket leaking oil via the return or supply ports to the valve train.  It could also be leaking oil from the front of the engine (crankshaft seal) and blowing back along side the engine block as the car is driven....and then dripping down after the car is parked. 

Have the engine steam cleaned and then look for where the oil is coming from. 
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Randys01

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Re: Manifolds and blanking plates
« Reply #2 on: 24 June 2020, 05:00 PM »
I'm thinking the same as UTN.

floyd111

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Re: Manifolds and blanking plates
« Reply #3 on: 24 June 2020, 05:25 PM »
Is your mechanic from Taiwan? ;D If not, send him here and the average skills in both our countries will go up immediately.

Lance

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Re: Manifolds and blanking plates
« Reply #4 on: 24 June 2020, 08:08 PM »
Look down to the left of the spark plugs, you will see a drain hole for the oil that collects in there from cam cover leaks. These drain out to the side of the block, near the mating surface with the head under the exhaust manifold. Put a new rocker cover gasket on and clean out your PCV valve, it is likely clogged. Or just don't worry about it and top up the oil every now and then.

Fergus

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Re: Manifolds and blanking plates
« Reply #5 on: 24 June 2020, 10:34 PM »
Many thanks Lance, Floyd, Randy and UTN for your very constructive comments. Most helpful. The engine apparently had been steam cleaned to check for leaks.

Every day a learn a little more

Cheers

Fergus