Hello guys, I am new to the forum and would like to say thank you for the vast amount of information you guys provide to people like me…newbies….I am having hell with this one and I was wondering perhaps there is someone in here that could lend me some knowledge on what else to do..
I bought this abandoned boat with a 90hp Johnson J90SLEOC 2 strokes V4 that I thought I could make it work myself….it’s been a pain so far
The engine starts fine but it dies right after a few seconds, if I push the key in short pulses after starting I can hold it running a little bit longer but it dies anyways.
Here is what I have done so far:
--compression check, came in at 120, 119, 118 and 112….the book says that as long as there is not more than 10% difference compression is fine.
--I gave the engine a new set of recommended sparks plugs calibrated according to the service manual
--I do have sparks
--The power packs were replaced with new ones as I saw them with some cracks and rust in the back
--Carburetors were extremely cleaned twice each, one by one were dissembled placed into chemdip for 24 hours, all passages inspected and cleaned, ran fine steel wire through passages, compressed air flushed, cleaned and given a new rebuilt kit to each one of them…including new sets of bowls as the new ones were kind of curved
--Manifold taken apart, cleaned just like the carburetors and new gaskets given as well (the ones facing the intake)
--New O-rings where the fuel enters the carbs
--solenoid was given a new rebuilt kit and has no leaks
--fuel vapor separator rebuilt with new kits…no leaks there
--Fuel Pump replaced with a new standard premixed pump driven by the Pulse limiter
--I got new pulse limiter as well
--new fuel filter
--Followed the service manual and confirmed TDC and linkage adjustment
--I am using a 3 gallons portable tank with fresh fuel connected straight to the engine fuel filter
I have no leaks whatsoever now and it keeps doing the same thing, this engine was using the pre-mix VRO type of fuel pump but it was leaking everywhere so I decided to use a standard one….
Test that I have done after all of the above was changed…
……With ignition off I disconnect fuel hose going into carbs and give the engine some crank and I can see burst of gas coming out.
……right away after the engine dies I open the carbs drain screw and all have gas on them
But same thing…starts when solenoid is activated pushing key in but dies right away, I even tried pressing the bulb primer while it runs but dies too…when it starts I could hold it for a minute maybe by pushing the key in and out periodically but dies as well…
Any opinion here?...any other test I could perform?...initially I thought I had fuel starvation but after all of the above I did….I just cannot think any further…
I will greatly appreciate any input from you guys.
Regards.
I bought this abandoned boat with a 90hp Johnson J90SLEOC 2 strokes V4 that I thought I could make it work myself….it’s been a pain so far
The engine starts fine but it dies right after a few seconds, if I push the key in short pulses after starting I can hold it running a little bit longer but it dies anyways.
Here is what I have done so far:
--compression check, came in at 120, 119, 118 and 112….the book says that as long as there is not more than 10% difference compression is fine.
--I gave the engine a new set of recommended sparks plugs calibrated according to the service manual
--I do have sparks
--The power packs were replaced with new ones as I saw them with some cracks and rust in the back
--Carburetors were extremely cleaned twice each, one by one were dissembled placed into chemdip for 24 hours, all passages inspected and cleaned, ran fine steel wire through passages, compressed air flushed, cleaned and given a new rebuilt kit to each one of them…including new sets of bowls as the new ones were kind of curved
--Manifold taken apart, cleaned just like the carburetors and new gaskets given as well (the ones facing the intake)
--New O-rings where the fuel enters the carbs
--solenoid was given a new rebuilt kit and has no leaks
--fuel vapor separator rebuilt with new kits…no leaks there
--Fuel Pump replaced with a new standard premixed pump driven by the Pulse limiter
--I got new pulse limiter as well
--new fuel filter
--Followed the service manual and confirmed TDC and linkage adjustment
--I am using a 3 gallons portable tank with fresh fuel connected straight to the engine fuel filter
I have no leaks whatsoever now and it keeps doing the same thing, this engine was using the pre-mix VRO type of fuel pump but it was leaking everywhere so I decided to use a standard one….
Test that I have done after all of the above was changed…
……With ignition off I disconnect fuel hose going into carbs and give the engine some crank and I can see burst of gas coming out.
……right away after the engine dies I open the carbs drain screw and all have gas on them
But same thing…starts when solenoid is activated pushing key in but dies right away, I even tried pressing the bulb primer while it runs but dies too…when it starts I could hold it for a minute maybe by pushing the key in and out periodically but dies as well…
Any opinion here?...any other test I could perform?...initially I thought I had fuel starvation but after all of the above I did….I just cannot think any further…
I will greatly appreciate any input from you guys.
Regards.