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Author Topic: Sooty Intake Manifold on M35B  (Read 125 times)

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KeelsonGraham

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Sooty Intake Manifold on M35B
« on: July 23, 2022, 12:40:16 AM »

Recently, after taking off the air filter to clean it, I ran my finger around the inside of the manifold and picked up a very thin film of oily soot. Iím experienced with auto petrol engines - not with diesels, but I assume this is abnormal?

The engine starts immediately first time, every time and runs sweetly (albeit a little hot) so Iím reluctant to fix it if it ainít broke.

I assume this could be due to back flow from one or more inlet valves, either because the tappet clearance is too small or because a valve isnít seating correctly?.

Has anyone else seen this?
« Last Edit: July 23, 2022, 12:41:14 AM by KeelsonGraham »
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2006 Catalina 34 Mk II. Hull No:1752

KWKloeber

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Re: Sooty Intake Manifold on M35B
« Reply #1 on: July 23, 2022, 01:33:47 AM »

When The B engines go out the factory door they have the crankcase breather hose run to the air intake.  Does yours?
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KeelsonGraham

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Re: Sooty Intake Manifold on M35B
« Reply #2 on: July 23, 2022, 10:17:32 AM »

iíll check!
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Ron Hill

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Re: Sooty Intake Manifold on M35B
« Reply #3 on: July 23, 2022, 01:33:00 PM »

Keel : I don't believe that you have a problem.  As Ken said the newer Universal M35B and XM25 XPB engines all have their oil pan breather vented in to the intake manifold.

A thought
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KeelsonGraham

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Re: Sooty Intake Manifold on M35B
« Reply #4 on: July 24, 2022, 12:25:37 AM »

Thank you Ron. The oil breather would certainly explain it.
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