Brown goo on plug

[markdsr]

I have a 96 Challenger with a 787. I rebuilt the motor 6 months ago and everthing ran fine until yesterday. On my way home there is a long pass where there is a no wake zone. After crossing it I could not get past 5500 rpms, it just ran bad. When I finally got home I pulled the plugs and found the PTO side covered in brown goo, it almost looked like dog sh__. Some how I'm getting water in that cylinder. I am very careful when I run it on the hose to follow correct procedure but the hose does have extremely high pressure. I did a compression check and both sides are at 155 psi. Could the head O-ring have failed and still give that high of a reading or could the water come from some where else?

 

[Dr Honda]

Unless there is a crack in the head shell, or a base gasket is ripped (but you would see that with other issues) you should not be able to get water in the engine if it is running.

On the hose... if you got water into the engine... as soon as it started, you would purge it out.

Put in a fresh set of plugs, and see if it happens again. How old were the plugs in it? can you post a pic of the plug?

 

[markdsr]

Water in motor

I rotate plugs before each use so I put in different plugs and ran it on the hose. The tell tale was less than usual and after running I pulled the plugs, there was clear water on the PTO plug. I am going to remove the head and see what I can find.

 

[Dr Honda]

on the hose... the pisser won't be very strong... but if you have noticeable water on one of the plugs... then yes, the head needs to come off.