Gunk piled up on spark plug J150

[jwellcraft]

Re: Gunk piled up on spark plug J150

I will be pulling the head off of the other bank as well just to check and clean if necessary and replace o-rings. Will send pics of this side as well.

 

[jonesg]

Re: Gunk piled up on spark plug J150

Test the head for flatness by laying it on a sheet of glass, see if theres any wobble to it. Although you have decent compression so I would check the recirculation valves for clogging, something is causing that gunk to form.
If it was forming steam the plug would be very clean.

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

Ok I will check for any warps, so you don't think there is water intrusion (which would be great if not) and you think the plug would still get cleaned if water was coming in and mixing with the oil and gas?

 

[jonesg]

Re: Gunk piled up on spark plug J150

From reading many posts, users are alerted to steam in cyl by new looking sparkplug. But the recirculation valve for that cyl might be clogged causing the gunk on the plug.

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

I checked these hoses the other night (just by blowing and sucking) to see if there were clogged but they seemed fine. Will do the correct procedure with running it and checking it in a cup of water. The carbs were rebuilt not long ago (1 year maybe) so I don't think they are in need of another rebuild.

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

It does look really "clean" in there. They all look similar except that one exhaust port ???. That's why i asked the "what the other side looks like" question.

These are pics of the other side (Port) before any cleaning at all and if you look at each exhaust chamber they are clean but the #6 piston is damaged but I think this was put in here like this (previous owner didn't want to buy a new piston) it still has good compression but I will be changing this soon and re-ringing all of the pistons. Also forgot to mention that all pistons had a little play in them except the #1 (starboard) which was so clean. I could not move this at all from side to side so I think maybe this was a new piston and a new set of rings but still doesn't explain the build up. Anyway this is all clean now and I will see how long this will take to build back up.

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

Hey guys, after all of this de-carbing and cleaning I put the heads back on with new o-rings and now I get 75psi of compression in 5 cylinders and in the #1 cylinder that had the clean piston and with all the carbon in the exhaust port just goes up to 20psi of compression (stuck rings maybe?). I am still using the same OTC guage but will definately have to borrow another one just to confirm.

 

[ezeke]

Re: Gunk piled up on spark plug J150

Hey guys, after all of this de-carbing and cleaning I put the heads back on with new o-rings and now I get 75psi of compression in 5 cylinders and in the #1 cylinder that had the clean piston and with all the carbon in the exhaust port just goes up to 20psi of compression (stuck rings maybe?). I am still using the same OTC guage but will definately have to borrow another one just to confirm.

Sounds like you are trying to use an old head gasket.

If that first picture of the port cylinders is any indication, your de-carbon treatment is a failure.

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

Those pics were before any cleaning...I cleaned them out when the heads were off and about the head gasket you are talking about..there is no head gasket for these years apparently so I just used a little RTV silicone around the water jackets but I wish they made head gaskets for these.

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

I completly decarbed all cylinders and exhaust chambers with engine tuner by pumping them full and it drained straight down and came out the lower until it was just a little brown no more black. Went out and ran it and trolled for a couple hours and started to hear a pinging when that cylinder stopped firing I guess and sure enough after I flushed it at home and pulled that #1 spark plug it was crammed with gunk again. So guys is there any other place other than the water jackets that could allow water access to this one and only cylinder?

 

[jonesg]

Re: Gunk piled up on spark plug J150

I believe the exh cover gaskets can pass water.
The "gunk'd" plug is curious though, it should look steamcleaned, not gunked.
You certain the recirculation valves and hoses are clear.?

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

Yes the recirculation valves and hoses are clear according to the cup of water test with the motor idling and putting the end of each hose in the water and it bubbles but I didn't go any further. May I should check the carb for that cylinder, but can't understand why it would start and idle so good. If there was water intrusion though with fuel/oil mixture, you still think it would get steam cleaned?

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

Hi guys, I just spoke with a mechanic that has worked for the Johnson/Evinrude dealers years ago and he told me that it's a cast problem that these blocks has and the only way out is to repalce the block and he said it was consistent with all of them and it was only the #1 cylinder that collected moisture/condensation. I don't understand why this motor would still be around for so long after if it was that, because if it was a cast problem wouldn't this have been noticed from day 1?

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

The 78YC is just a bit hotter than the 77JC4 and a longer reach plug. Either will be fine in a 60* looper. "Gunk" build up on #1 plug may, possibly, indicate a water leak. the early 60* blocks had an issue with a glue seam leak in the casting which showed up on the #1 cylinder.

Thanks Dhadley, I didn't pay too much attention to this at the time but I see all kinds of write ups about these blocks. Having it welded soon and hopefully that cures the prob.

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

The 78YC is just a bit hotter than the 77JC4 and a longer reach plug. Either will be fine in a 60* looper. "Gunk" build up on #1 plug may, possibly, indicate a water leak. the early 60* blocks had an issue with a glue seam leak in the casting which showed up on the #1 cylinder.

Does anyone know the exact spot of this glue same leak? I would like to know for my welder to go at it and make sure I get the right spot.

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

Hey guys, got some welding done on the block where seemed to be a problem spot because the original owner of the motor grinded down a seam area which I think was pretty thin and must have applied something to it but after years of heat and vibration it must have come off so this spot wash bright and shiny. So I made the welder build up that particular spot using a tig welder and I took it out for a test a couple of days after and I have more water coming in now that I ever had, I even had water in the #6 cylinder this time. So I carefully examined the water jacket area just under the voltage regulator and noticed a crack about 1 1/2 inch long not far from where I had the welder build up so I am heading back to him to have that welded to see if it stops and hopefully that's the prob. I was going to use some marine grade JB weld but he said not to until he looks at it so we will see what happens next.

 

[Faztbullet]

Re: Gunk piled up on spark plug J150

Does anyone know the exact spot of this glue seam leak?

Yes its in cylinder #1 and runs from the 11 to 4 o'clock position in casting and can only be fixed by pulling sleeve,welding,remachining and resleeving. This happens over the years from heating and cooling of block and vibration.
Here is link :http://www.mar-fab.com/MarFab_Tech_Bulletins_D9579.pdf

 

[oldgradywhite]

Re: Gunk piled up on spark plug J150

Looks like you got some real problem take the exhaust cover off and inspect. I if this things from the early 90's they had a problem called coking( excessive carbon build up. I thought with the e 85 this problem when away

 

[jwellcraft]

Re: Gunk piled up on spark plug J150

Yes its in cylinder #1 and runs from the 11 to 4 o'clock position in casting and can only be fixed by pulling sleeve,welding,remachining and resleeving. This happens over the years from heating and cooling of block and vibration.
Here is link :http://www.mar-fab.com/MarFab_Tech_Bulletins_D9579.pdf

Yes thanks, I saw this link a couple of weeks ago and gave them a call and they will repair for $675.00 but another company in Tampa FL would do it for $300 but they were booked up for the season and offered to walk me through the repair with a welder.

 

[Faztbullet]

Re: Gunk piled up on spark plug J150

You will need to build some block off plates to pressure test block to ensure weld is not leaking...and engine does not have exhaust covers..