Deiseling when fogging
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=37293
Printed Date: November-17-2024 at 1:40am
Topic: Deiseling when fogging
Posted By: Riley
Subject: Deiseling when fogging
Date Posted: September-08-2015 at 10:57am
| Anyone ever experience dieseling when fogging an engine? I fogged one yesterday and it is the 2nd year in a row it has done it. Never have had that happen before. |
Replies:
Posted By: gun-driver
Date Posted: September-08-2015 at 11:13am
| Spray in more fogging spray till it completely chokes out. |
Posted By: JDD33
Date Posted: September-08-2015 at 10:48pm
|
Yup more fogging oil! I've found over the years that 2 cans make a difference. One in each hand or one for you and one for your assistant! Chokes em right out! ------------- Old school goin back to school! |
Posted By: 8122pbrainard
Date Posted: September-08-2015 at 11:15pm
|
50-50 mix of Marvel and engine oil out of a pump oiler is my favorite for fogging. I have used an aerosol but always go back. I learned the 50-50 way back fogging at Watercraft Sales in the late 60's. The home made will always choke out the engine but as mentioned, it almost takes two cans at once to choke the engine with an aerosol. I feel you get more in the engine with the homemade. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: SNobsessed
Date Posted: September-08-2015 at 11:32pm
|
Have same problem, can't kill it with the can. Maybe just turn out the idle screw to slow it down 1st? ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: Riley
Date Posted: September-08-2015 at 11:37pm
| My problem isn't being able to kill the engine. I actually try not to kill it as I read somewhere, (maybe in the PCM manual) that choking out a 4 stroke engine can actually do harm to the valve train, but I don't want to get into that. This engine, this year and last year dieseled when I turned the key off which seemed pretty strange as it had never happened before. I was wondering if anyone else ever had it happen. |
Posted By: SNobsessed
Date Posted: September-08-2015 at 11:39pm
OK, I misunderstood. Never had that problem; maybe you have some carbon built up on a valve or plug. ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Riley wrote:Posted By: Gary S
Date Posted: September-09-2015 at 12:13am
One thing not mentioned is - your doing it way too early! Higher air temps = higher intake temps creating a self igniting condition   ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: TRBenj
Date Posted: September-09-2015 at 12:32am
|
Seems logical to me that fogging oil by its very nature contains oil, in order to coat the cylinder walls. Oil burns a lot slower than gas, so it wouldn't surprise me if the oil burned long enough after removing spark to provide ignition for a few more rotations. I fog with whatever cheap motor oil I have on hand. Seems to work better than the aerosol. |
Posted By: DayTony
Date Posted: September-09-2015 at 1:28am
|
Ive never had that happen to me. You must have some dam good compression. I always use an atomizer with straight ATF when i fog. Get a good coat into the engine through the carb whilst running. Once it starts to choke out i hit the air bleeds on the carb on my way out then i kill it with the ignition. I then proceed to coat a lot of the engine with that or wd40. At the same time as this is all happening i am sending antifreeze through the system. So once and done. ------------- 1988 Barefoot nautique-454 |
Posted By: 81nautique
Date Posted: September-09-2015 at 8:52am
| What motor is it Bruce? Does it happen to have a fairly high compression ratio to start with? Tim's logic sounds plausible. |
Posted By: Riley
Date Posted: September-09-2015 at 9:28am
|
It's an Indmar 310 carb. Stock Vortec, so I would guess the compression is relatively low. Maybe the fogging oil builds compression? We've owned the boat for 12 years and it never did it until last year. I typically use any aerosol product which is what I used last year. This year I used MMO as that is all I had. The noise that comes out of the top end when dieseling makes me think I'll forego spraying it in the carb next year and spray it in the spark plug holes instead. Gary, it is early, but I winterized my BIL's boat 3 weeks ago and while it was 90 degrees yesterday, the leaves and acorns have been dropping for 2 weeks. This boat clocked 67 hours this year and won't be getting used again until next year. |
Posted By: NCH20SKIER
Date Posted: September-09-2015 at 9:56am
|
I am with Pete on this the Mystery Oil has long been my friend in fogging and post recovery of outboard engines and snowmobiles that have been raised from the depths of Maine Lakes. ------------- '05 206 Limited '88 BFN |
Posted By: Riley
Date Posted: September-09-2015 at 10:00am
| I used the MMO for fogging as I've always heard that people used it and that's all I had at the time. I did some research on it yesterday and for fogging, I found many people swear by it, but a few say it will ruin your engine as it has solvents in it. At this point all I know is it makes a nice cloud of sweet smelling smoke. |
Posted By: GottaSki
Date Posted: September-09-2015 at 10:28am
|
Maybe its the propellent, acting like ether, adding the propensity to diesel and thus light up the oil. Consider chaning from fogging spray/foam to straight 2-stroke oil. Its primarry mission in life is to coat and protect the upper cyllinder and rings. Make some good smoke, shut it down. ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |
Posted By: 8122pbrainard
Date Posted: September-09-2015 at 10:30pm
Bruce, All oils have solvents. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |