'74 22-2

[fitz73222]

OK, which one?
P150TLRX
S150TLRX
PX150TLRX
AX150TLRX

[love2fish]

Sorry- P150TLXR

[fitz73222]

I'm surprised but it has an old fashioned mechanical choke and no enrichner system. I cant find the choke solenoid or plunger in the diagrams but I found all of the linkage and manual choke lever. Is that engine hard to start cold? It does look like a plunger for a choke solenoid. Look on the back side of the air silencer box and see if there is a solenoid. Trace the choke linkage from the pull out lever at the bottom cowl and see if you can find it.

[love2fish]

Yes- it has a mechanical lever on the front of the cowling to pull for a choke on first starts- it usually starts right up on cold starts.

Took it to the ramp today- probably killed every mosquito in a 2 mile range- by the time I made it down the gandy boat ramp canal- she was running ( barely smoking) like normal.

Will investigate more tomorrow- there is a random spring that isn't connected to anything towards the top of one of the levers on the top starboard side.

[futch13]

http://www.boats.net/parts/search/Yamah ... parts.html  #24 & 27  solenoid and o-ring/keeper

Check your motor reservoir sender for leakage when tilted.

[fitz73222]

So Chris,
Do you have to pull that choke lever to start the engine cold or do you push in on the key and she starts right up? This still doesn't explain the raw oil coming out of the exhaust. When I was looking at your engine diagrams yesterday, I was looking at your oil injection system and saw that your oil is fed directly into your intake plenum and saw an array of check valves that meter the oil going into the intake. Now if one of those check valves is stuck open, maybe on one or both of the bottom cylinders, it could cause oil to puddle in the bottom of the block just from gravity and cause the mosquito control festival on start up until it clears out. This may also explain the drip of raw oil coming out the exhaust while sitting. You have a gear driven oil pump so I'm not sure how oil could pass through the pump without the engine running and feed oil into the intake via gravity so it is the hitch in my theory. I need Loye to substantiate or dispell this assumption.

[futch13]

So Chris,
Do you have to pull that choke lever to start the engine cold or do you push in on the key and she starts right up? This still doesn't explain the raw oil coming out of the exhaust. When I was looking at your engine diagrams yesterday, I was looking at your oil injection system and saw that your oil is fed directly into your intake plenum and saw an array of check valves that meter the oil going into the intake. Now if one of those check valves is stuck open, maybe on one or both of the bottom cylinders, it could cause oil to puddle in the bottom of the block just from gravity and cause the mosquito control festival on start up until it clears out. This may also explain the drip of raw oil coming out the exhaust while sitting. You have a gear driven oil pump so I'm not sure how oil could pass through the pump without the engine running and feed oil into the intake via gravity so it is the hitch in my theory. I need Loye to substantiate or dispell this assumption.

Those check valves are just duck bills to keep any thing from going back into oil lines.  there are check valves in the oil lines, pump to intake, but they are just to keep oil from back feeding to pump when motor is turned off.  Don't know where straight oil is coming from out of the exhaust unless motor was cranked continuously with out fuel in the system and oil pump was at WOT...???

[fitz73222]

Since Chris has linkage pieces laying around pan, maybe the oil pump flow control linkage from the carb? I know on a Merc if the link arm is disconnected the pump arm is spring loaded to full dump as a safety measure which helps explain the smoke on start up but not the at rest oil loss. I might be inclined to drop the gearcase and see if everything is saturated with raw oil maybe pointing to a leaking crankshaft seal, (oil running down the driveshaft and making its way out the exhaust) I've seen that one.

[futch13]

Since Chris has linkage pieces laying around pan, maybe the oil pump flow control linkage from the carb? I know on a Merc if the link arm is disconnected the pump arm is spring loaded to full dump as a safety measure which helps explain the smoke on start up but not the at rest oil loss. I might be inclined to drop the gearcase and see if everything is saturated with raw oil maybe pointing to a leaking crankshaft seal, (oil running down the driveshaft and making its way out the exhaust) I've seen that one.

Same with Yammi on the full oil flow if disconnected.  Yamaha doesn't have the ck valve between the pump and the fuel line that allows oil to enter fuel when it is stuck open like Mercury.  The lower crank seal could be bad, like the idea of dropping gearcase to ck.  Although if it is just oil, don't know where it's coming from as by the time it hits the lower seal it should be mixed with fuel.

[fitz73222]

Agree, but she seems to have raw, puddled, un burned oil coming from somewhere internally. Open crankcase bleed valve on the bottom letting oil puddle while running and draining at rest? That oil is before combustion on the intake side of the block. Or a internal leaking oil pump? I'm totally grasping at straws now.

[futch13]

Agree, but she seems to have raw, puddled, un burned oil coming from somewhere internally. Open crankcase bleed valve on the bottom letting oil puddle while running and draining at rest? That oil is before combustion on the intake side of the block. Or a internal leaking oil pump? I'm totally grasping at straws now.

Leaky oil pump, maybe, but would have to have bad crank seal also.  It has me bumfuggaled LOL  Now that Chris has run it, I would let sit for a week or so and see if anything else leaks.  If not, I would turn the radio up and just run it LOL

[fitz73222]

Yep, me befuddled too! Nothing like trying to do an Internet engine fix! As seen in the picture, if the engine only fills one scallop shell with raw oil, we would consider this normal loss, three scallop shells is to much. LOL. Chris, take the boat to Loye since we have 50% of the befuddledness out of the way!

[love2fish]

Noticed some oil build-up in the pan, but can not tell where it's coming from without taking the air box off (didn't have tools with me at the time.
Was thinking last night and remembered: I put a cover over the console and upper station- and realized after 2-3 days of the cover being on, the wind moved the cover some and actually moved the throttle lever forward to probably 1/3 or 1/2 throttle. These are the old school morse controls- is it possible that that opened the carbs and any other linkage- allowing the oil to flow - thus giving me the "basically" solid oil flow out of the exhaust (as I didn't have the gas tank in the boat at the time)?

-maybe an easy fix/realization and also explains why the problem has not returned??

[futch13]

Noticed some oil build-up in the pan, but can not tell where it's coming from without taking the air box off (didn't have tools with me at the time.
Was thinking last night and remembered: I put a cover over the console and upper station- and realized after 2-3 days of the cover being on, the wind moved the cover some and actually moved the throttle lever forward to probably 1/3 or 1/2 throttle. These are the old school morse controls- is it possible that that opened the carbs and any other linkage- allowing the oil to flow - thus giving me the "basically" solid oil flow out of the exhaust (as I didn't have the gas tank in the boat at the time)?

-maybe an easy fix/realization and also explains why the problem has not returned??

Throttle plates being open shouldn't have anything to do with it.  Without the oil pump spinning it shouldn't let that much oil thru.  I'm still trying to figure out how "straight oil" is coming out of the exhaust.

[love2fish]