SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: Duke on March 03, 2012, 06:43:36 PM

Title: wet spark plug bbc??
Post by: Duke on March 03, 2012, 06:43:36 PM

Hey whats up.  So I went to change out my spark plugs and noticed my number three cylinder spark plug was covered in fuel. I turned the engine over without any spark plugs in it and the number three cylinder spits out fuel. Not sure if I have a bad intake valve or what the problem is. Any ideas?

1- 110 lbs. per sq. inch . the spark plug was black
3- 89 spark plug was black and wet.
5- 100 spark plug was black.
7- 105 spark plug had very little soot on it

2- 111 only about 1/2 black soot on the spark plug
4- 103 5/8ths black on the spark plug
6- 107 3/4 black soot on the spark plug
8- 106 spark plug was black.

this is after i put in new spark plugs mr44t acdelco plugs and ran it for a few minutes last week when i found the problem and today i ran it for about 7 minutes to warm it up for the compression test.

Title: Re: wet spark plug bbc??
Post by: GT Jets on March 03, 2012, 07:04:07 PM

Quote from: Duke on March 03, 2012, 06:43:36 PM

Hey whats up.  So I went to change out my spark plugs and noticed my number three cylinder spark plug was covered in fuel. I turned the engine over without any spark plugs in it and the number three cylinder spits out fuel. Not sure if I have a bad intake valve or what the problem is. Any ideas?

1- 110 lbs. per sq. inch . the spark plug was black
3- 89 spark plug was black and wet.
5- 100 spark plug was black.
7- 105 spark plug had very little soot on it

2- 111 only about 1/2 black soot on the spark plug
4- 103 5/8ths black on the spark plug
6- 107 3/4 black soot on the spark plug
8- 106 spark plug was black.

this is after i put in new spark plugs mr44t acdelco plugs and ran it for a few minutes last week when i found the problem and today i ran it for about 7 minutes to warm it up for the compression test.

The low compression on #3 was more than likely due to a fuel washed cylinder wall..Shoot a bit of oil in that cylinder through the spark plug hole and fix your carburetor (either float/seat problem or dribbling accelerator pump would be my guess...)..

Good luck...

GT

Title: Re: wet spark plug bbc??
Post by: Duke on March 03, 2012, 07:12:42 PM

what kind of oil do i shoot in there? just some conventional motor oil?

i'll take a look at the carb soon

Title: Re: wet spark plug bbc??
Post by: GT Jets on March 03, 2012, 07:49:59 PM

Quote from: Duke on March 03, 2012, 07:12:42 PM

what kind of oil do i shoot in there? just some conventional motor oil?

i'll take a look at the carb soon

I would recommend whatever you're running in the crankcase....But anything oily would work.. :thumbup:

GT