Ned advice please - J60Tlcih - fuel in exhaust

[customvs]

hi all,long story short,Motor slightly overheated a few weeks ago,steam coming from exhaust,quickly put to idle,started pumping water again,and putted her home.Ran fine at home for 10 minutes at idle whilst i cleaned it.

Pulled apart today and replaced thermostat,impeller,gaskets etc etc,Also replaced a broken timing/stator plate linkage.

just put back together,and it will fire and run for 5 seconds only,with a lot of fuel/oil in my water barrel and running out of exhaust,whole leg is covered in oil/fuel.

compression test,just showed 135 psi in both pots.

also noticed the adjustable stator timing plate is not moving with the throttle to its rubber stoppers,i thought this should be advancing with the throttle,is this correct.

 

[Joe Reeves]

Re: Ned advice please - J60Tlcih - fuel in exhaust

Your engine's model number J60TLCIH indicates that your engine ia a 1981 60hp Johnson.

Yes, the timer base should move as soon as the throttle cable starts to advance. It should move smoothly all the way to its full spark advance position after which only the throttle butterflies continue to move further open.

Find out why the timer base is not moving and correct that problem first. Let us know what you find.

 

[customvs]

Re: Ned advice please - J60Tlcih - fuel in exhaust

ok,got the motor running and idling,tell tale is very strong,no water out of exhaust ports though,motor started to overheat so i quickly shut it down,Also still evry fuely and oily,alot more in my water barrel than normal.

I checked and rechecked the impeller and its inserted correctly.

any ideas ?

 

[Haffiman]

Re: Ned advice please - J60Tlcih - fuel in exhaust

The oil in the barrel is what you normally leave after you in the lake when driving! As for 'no water', you may have a problem with the upper watertube grommet which is a 'pain in the AA' to get to.
Pull down the gearcase, attach a water hose directly to the tube and check flow.

 

[Joe Reeves]

Re: Ned advice please - J60Tlcih - fuel in exhaust

Customvs.... So, is the timer base moving to its rubber stop as it should now?

Test your heat "horn" warning system..... Engine not running, key in ON position, ground out the TAN wire you see protruding from the cylinder head.... the horn should sound off. Does it?

If the horn sounds off via the above test, the horn will sound before the engine is hot enough to do any damage, hence the horn title of "Warning". Are you sure the engine is still overheating?

The "ports" you mention are not actually there to show you that the water pump is working properly. They are "Exhaust Relief Ports" and their purpose is as follows:

(Exhaust Relief Ports - Exhaust Housing (Inner/Outer)
(J Reeves)

The long housing between the powerhead and the lower unit is called the exhaust housing. There is a inner housing within it that has a heavy duty seal around the bottom of it, or heavy duty seals around a inner extension between the housing and the lower unit.

The red hot exhaust travels down thru that inner tube and out the propeller with a somewhat supply of water to cool the propeller hub. A good amount of water surrounds and fills the space between the outer and inner tube, otherwise the outer housing would get so hot that the paint would burn off.

Some water pumps, for some reason (differing even when new) exert a great amount of water pressure, and if the exhaust housing seals are in perfect condition, the water fills the tube to a point of overflowing.

This brings into play those two holes or slots, whichever the engine might have, at the top rear portion of the exhaust housing just below the powerhead.

Now, if those two holes/slots weren't there, water would continue to flow up into the cylinders. Water not flowing out of those holes is no concern for alarm UNLESS that outer housing suddenly becomes extremely hot..... the warning horn should sound long before that happens.

The main reason for those holes being there (exhaust relief holes) is that when at an idle, there is an extreme amount of resistance encountered by the exhaust trying to escape due the fact that the outlet via the propeller is now blocked by a wall of water. The escape route in this case is for the exhaust to escape out those two holes, otherwise the engine would slow down quite quickly and die. If exhaust cannot escape, air/fuel cannot gain entrance to the engine.

 

[customvs]

Re: Ned advice please - J60Tlcih - fuel in exhaust

hi,thanx for the replies,motor is definately overheating,alarm sounding,and cannot put a hand on the head or block due to very hot,Tell tale also got to the point on near boiling,thats when i shut down and let cool overnight,I have just removed the water cover plate,checked thermostat etc.Thermostat appears to be seated correctly but i noticed it had fuel/oil on the inside as well as the little red plastic pressure relief valve had fuel/oil on the inside of it and i also need pliers to remove,its seated very firmly in there,is this normal ??it also looks as though no water had enterered into the channels all around the head,as it was still bone dry and no watedr leaked when i removed the plate and new gasket.

also should the thermostat be seated in a rubber ring,or does it just sit flush into the head,
with the ring that was supplied it looks like it might be jamming it up.

 

[customvs]

Re: Ned advice please - J60Tlcih - fuel in exhaust

I have removed the head and cleaned,doesnt look to bad for 29 years old and have also just dropped leg and put hose straight to the water tube,water came out of the block freely and flowing.the head gasket was very swollen in numerous places,not sure if this had anything to do with lack of water and overheating,what else can i do to check water passages ??

 

[Haffiman]

Re: Ned advice please - J60Tlcih - fuel in exhaust

In severe overheat cases the exhaust cover gaskets may have to be checked. Leaking gaskets and exhaust goes straight into the cooling system. In your cas, I'm afraid you may need to lift off the powerhead to manage this.

 

[customvs]

Re: Ned advice please - J60Tlcih - fuel in exhaust

thanx for all your advice haffiman and joe reeves,motor is now running perfect,Water did not pump out the exhaust ports as it used to but from other threads and this thread it is probably not supposed to anyway,the tell tale stayed nice and cool /warm after 30 mins running,i could feel when the thermo was opening and closing by water temp.id have to guess it was the head gasket that was the problem,as well as the initial rotten broken thermostat,after inspecting the head gasket,i can see where it was blocking majority of water passages.i will retension head bolts after a few more running hours,and now i need to go and clean up my shed after 4 days of using every tool i own and chucking them around the shed with my temper flaring and the 4000 beers i drank fixing it.

 

[Joe Reeves]

Re: Ned advice please - J60Tlcih - fuel in exhaust

FYI.... Just above and to the rear of the cavitatiuon plate of the lower unit, there are either a series of holes or slots. Water exits those holes/slots ONLY when the thermostat opens.