John McLaughlin wrote:

I just received a used 1990 13B NA engine. Exterior of engine is clean - no
leaks, Turns over smoothly and evidences as much compression as possible
hand cranking. 6 ports were not functioning. I removed the intake manifold
to take a look.

As one would expect, there is a good bit of carbon and sticky black gunk in
both the main and auxiliary ports. I'm wondering how I should try to remove
the carbon. I'm worried about some of it finding its way into the rotor
housing and damaging the seals.

The seals feel good as felt through the exhaust ports - travel seems smooth.
I'd like to avoid tearing the engine apart, but obviously need to do
something with the buildup.

I've heard of using ATF to dissolve carbon buildup. Does anyone have any
other suggestions?

John McLaughlin

I would try cleaning the ports with gasoline when the intake ports are closed
by the rotor position.

People say spraying water into the intake while it is running helps
get it off the rotors. Perry claims disabling the EGR will burn it off
the rotors. I think he is right.

Paul Lamar
 
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