Help wife says NO Lower cranksaft seal leaking ??????

[StratosRob]

I think the lower cranksaft seal is leaking. Could this cause a problem with the performance of the motor. Number four looks real wet. 1,2,3 look fine. All the coils test fine and the sensor coils are ok got fire to all 4 plugs.Carbs. are ok 1988 90 johnson V4 the engine miss at 1500 RPM and higher. Timming is fine also. Compression is 120 on all cylinders
Please help wife will not let me take it to the shop says to much money has went into the boat already nothing to do with the motor just bought alot of fishing stuff.

 

[Joe Reeves]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Hopefully you're using Champion QL77JC4 plugs, gapped at .040 . If not, do so.

Number 4 coil. Remove the primary and ground wire temporarily. Remove the plug wire from the spark plug. With a ohm meter you should be able to obtain a reading between the plug wire and the ground wire, and between the plug wire and the primary wire. If not, find out why.

Often the spring terminal inside the plug boot does not make contact with the actual wire inside the plug wire assy. This results in a extra gap for the spark to jump and many times leads to the problem you're encountering.

It might be a good idea to check that continuity on the other coils also. Let us know what you find.

 

[Texasmark]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Hey Joe, just curious. Do you hang out with Dhadley from Port Charlotte?

Mark

 

[StratosRob]

Re: Help wife says NO Lower cranksaft seal leaking ??????

I'm using QL77JC4 Gap .40. I am getting a reading between the ground and plug wire.Anything else you can think of?

 

[F_R]

Re: Help wife says NO Lower cranksaft seal leaking ??????

So, does it idle on all four cylinders? I would expect a leaking lower seal to show up as a problem with idle long before becoming a problem with high speeds.

 

[StratosRob]

Re: Help wife says NO Lower cranksaft seal leaking ??????

F_R yes sir it idles on all four.(more like 3 1/8) Really it dont matter if I pull the plug wire off at idle or WOT. The RPM does not change. I can start it right up and haul tale nothing changes.Idle for 5 min nothing changes. I was told to check the fuel pump diaghm because #4 is what runs the pump off of crankcase preasure. So I removed it and this is what I found...there was fuel on the pulse side of the diaghm not alot but maybe a bottle cap full and in return the #4 cylinder was sucking up fuel plus was the carb. was giving it causing the plug to foul. And thats what caused the miss on #4 There should be no fuel on that side of the pump right? Think I said all that right. does that make any sense.
Thanks for anymore info.

 

[F_R]

Re: Help wife says NO Lower cranksaft seal leaking ??????

"F_R yes sir it idles on all four.(more like 3 1/2 Really it dont matter if I pull the plug wire off at idle or WOT. The RPM does not change----It should change. If it truly does not change, that cylinder is weak or not firing at all. OK, so it might not be real noticeable. But the change should be about the same no matter which wire is pulled.
You have hit on a couple of real possibilities. The fuel pump diaphragm. Squeeze the bulb and see if the fuel leaks out of the pulse side. If it does, the pump is toast.

And the lower seal is a possibility if everything else is OK and you can't find another reason for no power on #4 at idle and 1, 2, and 3 are OK. But it can also be a restricted idle jet on 4.

 

[StratosRob]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Ok will try that and see what happens.

Thanks

 

[Joe Reeves]

Re: Help wife says NO Lower cranksaft seal leaking ??????

StroatosRob..... Check the fuel recirculating valves, especially the #4 valve.

You should only be able to blow air thru the interior screened side towards the hose connection nozzle. If the reverse flow of air is possible, that would cause a problem.

Texasmark.... No, I've never met Dhadley but I'm aware of his intellect. Why?

 

[StratosRob]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Joe
What is a fuel recirculating valve and were would they be located?Manual has nothing about the valves. Could you be a lttle more detailed on the test please.Sorry I'm kinda new to the 2 stroke world.

 

[clint]

Help wife says NO Lower cranksaft seal leaking ??????

Check your plug wire at #4 and see if it is grounding out. It might be fine with cowel cover off. When cowel cover is put on it might be jumping, grounding out to it when full throttle is applied. I found that on my 140 evinrude. You can simply use a screw driver while running, ground screwdriver to engine and touch all around the spark plug wire and sparkplug boot also. What evidence on my engine was a wet and cleaner sparkplug from other 3 spark plugs which were always dark brown firing plugs. It only was affecting the bottom #4 cylinder which was touching the lock down bracket assembly on just that side, resting on the spark plug boot at the spark plug. It was always fine ran like a champ in the test tank or muffs with cowel cover always off. When I would take boat out and planed at 2500 but when I full throttled engine, it would miss. It would ground out to cover thru to engine. I replaced all 4 spark plug wires and also my rubber boots on the bottom of the 3 lockdown points were worn, ripped and also I replace them for a buck a piece. Let us know how you make out with your Engine. Good Luck!
Clint 8)

 

[Joe Reeves]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Trace the small hoses leading to the intake manifold. You'll find them connected to the recirculating valves.

 

[StratosRob]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Joe,

Can you use a none pulse type fuel pump on this motor ? or can you recommend a fuel pump that is'nt VRO because I am already pre mixing.Someone told me you can get a fuel pump for this motor for $50. then I was told it was'nt recommended. Help on this issue please

Thanks,
Robert

 

[Joe Reeves]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Of course one could always use an electric fuel pump, but from what I've heard one should be cautious as to the pressure exerted by the pump.

I have no knowledge about that aspect of the electric unit so hopefully someone with that expertise will jump in here with that information.

 

[StratosRob]

Re: Help wife says NO Lower cranksaft seal leaking ??????

The one i was told about was like the one on th SP modles or the one before the VRO came into play.

 

[clint]

Help wife says NO Lower cranksaft seal leaking ??????

Electric fuel pump is a bad idea. There would be no safety from the engine to shut it off. Most pumps rely on a oil pressure safety switch to shut pump off and safely prevents from running an endless supply of fuel if fuel line split or connections are loose. Try to rebuild or purchase the original pulse type recomended for your 2 stroker.
Clint :$

 

[Dhadley]

Re: Help wife says NO Lower cranksaft seal leaking ??????

If you chose to premix, the standard pump you mention is fine. Personally I'd opt for oil injection.

 

[StratosRob]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Ok I seen a post on the site from joe reeves that said you could use this pump PT# 438556. So would this work?Says that I will have to find( found it ) the big plug screw in the middle of two smaller threaded holes on the engine intake were the standard pump would have been mounted remove the plug and mount the new pump. OK the pulse line that operated the VRO would have to be pluged does this sound right. I'm not putting down anyones info but I always like second opinons.
Thanks,
Robert

 

[StratosRob]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Well fuel pump was no help. So it went to the DOC. Will post the outcome.

Thanks to all that tried to help.

 

[StratosRob]

Re: Help wife says NO Lower cranksaft seal leaking ??????

Update.. I replaced the fuel pump same problem. Took the boat to the dealer turned out to be the power pack the motor ran fine until it got to running temp. I'm fishing again thanks to everyone for all the help