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Author Topic:   VARNISH REMOVER /CARB / LACK OF PWR?

JOHN W MAYO posted 09-28-2002 12:46 PM ET (US)
What are the additives that you can add to your fuel to help remove varnish from the carb jets for Merc 150, mod. 1500, inline six?
I possibly had a leaning problem with a couple of cylinders (aluminum on plugs). Engine sat for 3 years, after changeing the plugs and running it for about the last 150 miles i have not had that problem again.
Boat: ravenge 19,weight 1500
motor: merc 150 , 1500,
top speed is 35.5,gps......should this not be faster?
rpm:4800 max it will do.
prop: alum 17
boat and motor are 1976,.....any idea how to increse the spead or is this all it should do
Bigshot posted 09-30-2002 09:24 AM ET (US)
Do a compression test first.
JOHN W MAYO posted 09-30-2002 03:19 PM ET (US)
I have previously done a compression test.
60 /125/120/125/ 15/ last cylinder unknown.
(i failed to have the engine warm when checked)
I HAVE NOT CHECKED IT SINCE I HAVE RUN THE ENGINGE MAYBE 175 MILES,....I think I have got to have better compression than it first showed now. I am suspecting I may have losened up the rings by running it.It had previously not been used for 3 years. It seems to actually be running pretty good now.
(I have change numerious wires including a coil wire with virtually 10 0/0 insualtion and added new plugs.) no plug problems.
jameso posted 09-30-2002 03:24 PM ET (US)
John,
From the figures you gave, you have a couple of blown cyls, take the Bigone's advice and do another compression test.
Even if you have good compression I would like to see the cyl walls to make sure they were not scuffed while running lean.
My 02, Jim Armstrong
Bigshot posted 09-30-2002 04:36 PM ET (US)
You are running about 100hp with those comp #'s. Do it agian but be prepared to start looking for a new engine.
Bigshot posted 09-30-2002 04:38 PM ET (US)
Can't look at cyl walls because these do not have heads. The only way to get somewhat of a peak is to remove the exhaust plate. I owuld not do that though.....lot of bolts gonna snap. With 15psi in cyl #5...you are in deep doo-doo.
JOHN W MAYO posted 10-01-2002 09:57 AM ET (US)
Thanks Jim and Bigshot...yes, i know it does not sound good. When i get back in town I will do another compression check.

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Author	Topic: VARNISH REMOVER /CARB / LACK OF PWR?
JOHN W MAYO	posted 09-28-2002 12:46 PM ET (US) What are the additives that you can add to your fuel to help remove varnish from the carb jets for Merc 150, mod. 1500, inline six? I possibly had a leaning problem with a couple of cylinders (aluminum on plugs). Engine sat for 3 years, after changeing the plugs and running it for about the last 150 miles i have not had that problem again. Boat: ravenge 19,weight 1500 motor: merc 150 , 1500, top speed is 35.5,gps......should this not be faster? rpm:4800 max it will do. prop: alum 17 boat and motor are 1976,.....any idea how to increse the spead or is this all it should do
Bigshot	posted 09-30-2002 09:24 AM ET (US) Do a compression test first.
JOHN W MAYO	posted 09-30-2002 03:19 PM ET (US) I have previously done a compression test. 60 /125/120/125/ 15/ last cylinder unknown. (i failed to have the engine warm when checked) I HAVE NOT CHECKED IT SINCE I HAVE RUN THE ENGINGE MAYBE 175 MILES,....I think I have got to have better compression than it first showed now. I am suspecting I may have losened up the rings by running it.It had previously not been used for 3 years. It seems to actually be running pretty good now. (I have change numerious wires including a coil wire with virtually 10 0/0 insualtion and added new plugs.) no plug problems.
jameso	posted 09-30-2002 03:24 PM ET (US) John, From the figures you gave, you have a couple of blown cyls, take the Bigone's advice and do another compression test. Even if you have good compression I would like to see the cyl walls to make sure they were not scuffed while running lean. My 02, Jim Armstrong
Bigshot	posted 09-30-2002 04:36 PM ET (US) You are running about 100hp with those comp #'s. Do it agian but be prepared to start looking for a new engine.
Bigshot	posted 09-30-2002 04:38 PM ET (US) Can't look at cyl walls because these do not have heads. The only way to get somewhat of a peak is to remove the exhaust plate. I owuld not do that though.....lot of bolts gonna snap. With 15psi in cyl #5...you are in deep doo-doo.
JOHN W MAYO	posted 10-01-2002 09:57 AM ET (US) Thanks Jim and Bigshot...yes, i know it does not sound good. When i get back in town I will do another compression check.