Residue in intake

Slonopotam · May 15, 2011

Hi,

I am replacing my cracked header. Took the intake today, both intake and intake ports(??) have a lot of black stuff in it.
1. What is it ? Is it normal ? If not, how do I prevent it from building up ?
2. Should I clean it up ? How ? Degreaser or air intake cleaner ?

https://lh5.googleusercontent.com/_dU-gQjNBjg0/Tc9MpETJFPI/AAAAAAAAAP4/dVhS7BGc4xA/s800/IMG_5801.JPG

https://lh4.googleusercontent.com/_dU-gQjNBjg0/Tc9Nqdz7p-I/AAAAAAAAAP8/z3awxF6lAAE/s800/IMG_5806.JPG

Thank you,
Andrey

american_zero · May 15, 2011

To an extent, oily residue in the intake is normal. It's caused by the PCV that is routed into the air intake. This is the same stuff that you may notice dirtying up the air filter. It probably doesn't matter too much if you clean it or not, but I always clean intakes when I pull them. Might just be a little OCD, but I like to clean things while I have them apart. A degreaser should work fine, just try to find something not caustic to aluminum. It's does not have to be really strong to clean that up - also use a brush to help remove it.

dobesrgrt · May 16, 2011

american_zero said:
To an extent, oily residue in the intake is normal. It's caused by the PCV that is routed into the air intake. This is the same stuff that you may notice dirtying up the air filter. It probably doesn't matter too much if you clean it or not, but I always clean intakes when I pull them. Might just be a little OCD, but I like to clean things while I have them apart. A degreaser should work fine, just try to find something not caustic to aluminum. It's does not have to be really strong to clean that up - also use a brush to help remove it.

I think he is talking about the intake and exhaust ports on the head, not the intake itself.

Did you look at the pics. ?

Wayne Sihler · May 16, 2011

Well the valve stems look clean,no build up on the back side of the head.I would just wipe the intake ports out with a rag soaked with some carb cleaner and call it good.

Slonopotam · May 16, 2011

Wayne Sihler said:
I would just wipe the intake ports out with a rag soaked with some carb cleaner and call it good.

Thanks,

This is exactly what I did.

Andrey

Residue in intake

Slonopotam

NAXJA Member #1358

american_zero

NAXJA Forum User

dobesrgrt

NAXJA Forum User

Wayne Sihler

NAXJA Member

Slonopotam

NAXJA Member #1358

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