yet another cooling issue

[skeeter91]

just replaced a waterpump in a 1986? XR2 150 at the request of the owner.so i did that,ran on the hose.it peed ok(owner said it wasnt at all before).water from the tale-tell seemed to get hot fairly quickly,i let idel for 15 min or so,the alarm never went off.called him said i was done .so he goes to the lake,says no pee-stream,didnt even idle 500 feet from the ramp and the alarm went off.he pulled the stats,says theres no water coming out.so if it pees on the hose but not in the water,chances are,the poppet isnt the culprit?hes bringing it back this afternoon so i can try to find the problem,any suggestions?

[Dr Honda]

has he been running shallow on a muddy bottom?? I see this all the time in the PWC world. The engine will "Pee" but it still over heats. Basically... years of running in the shallows fill the engine will silt, and that eventually packs and turns into something like concrete. (and the cooling passages are half of what they should be) But it also plugs up smaller orifices, and on engines with a T-stat... it plugs that too.

So... if the XR2 engine has a t-stat, or other regulator... I would check it out. Also... I would pull any other cover that is easy to get to... and see if there is any tell-tail signs of mud/sand/dirt.


Just some random thoughts.

[skeeter91]

put it in a big azz container of water,it wont pee,put the muffs on and it would,but not much.so while running i pulled the hoses to the stats.no water from starboard,very little from port.it would blow water out the exhaust releifs on the back of the mid.i checked the poppet and it looks to be working as it should,no binding or otherwise suspicious stuff.pulled the stats and covers off ran it ,no water.im not seeing any mud or trash in the obivious places,so next ill pull the lower and run a hose to the pick-up mtube and see if i get water in the powerhead that way.at least this will give an idea where the low/no water pressure issue may be .

[XstreamVking]

Yep, take the lower off and check the connection from tube to pump. Rubber grommet might be gone. Next might be the grommet under the power head. If no water is coming out of the block, something is really wrong.

[j_martin]

I have known some people that insist on starting the engine to see if it runs before they put it in the water. On a Merc V6 that'll usually take the impeller out.

All the water at the tell tale is from the t-stats. It should be hot. Normally that engine will be fully warmed up in about 15-20 seconds at idle.

[skeeter91]

yes! i suspect running it dry is why he asked me to change the pump out in the first place.cant tell ya how many times ive been at the ramp and heard folks doing this,only to have a heating issue the next time i see them on the water."yeah for$125.00 i can probablly fix that for ya!"
i am by no means a professional marine mech. but i have learned over the years to work on my own stuff(merc. and omc) and do the water pump,stat,poppet dance!
im doing this for one of my buddies in my fishing club.alot of them are young and have rigs with older motors that require a little maintenance and attention from time to time.
and then theres the guys who want outrun every one to the best spots,but thats another thread!
thanks for the responses guys,ill keep you posted on what i find this afternoon!

[XstreamVking]

J. Martin prob nailed it. Have seen the same thing, some people just don't get it...

[skeeter91]

dropped the lower,hooked a hose to the pick-up tube and voila!water was coming out of everywhere it was suppose to.so,upon inspection of the pump housing,theres no seal in the top of the pump where the white line-up tube goes,which i totally missed the when i put the impeller in(probabally too many blue moons at that point).going to just install a new pump housing kit,be done with it.

[XstreamVking]

I have sent myself back to waterpump class 101 myself, so I ain't saying nothing.

[skeeter91]

after a water test,motor heats up when accelerating,back down to idle and it cools down.removed the poppet,same thing,just a took a little longer to overheat.pulled the hoses from the stats while it was running to see if both were dumping water,starboard dribbled a little.removed stats,the thing still heats up.possible that one of the head gaskets is leaking compression and hot gases into the water jacket?

[XstreamVking]

Leak down test should show that.

[skeeter91]

this thing is driving me nuts!put head gaskets on,no change.runs perfect temp on hose,as soon as its under load,the temp creeps up and up until the horn goes off.ive run it without the poppet in and it only slows the length of time it takes to overheat.the poppet looks to be in perfect working order,as well as the seat.i pulled the powerhead to have a look at the adapter.with the exception of some water ,it doesnt look abnormal?the exhaust looks to be burning its way through the gasket,yes its a cheap gasket that will be replaced by a good hp one.any suggestions?

[skeeter91]

a few more

[Tango]

Looks like one of the issues I had with exhaust pressure getting into the cooling of the starboard side, causing the water stream to pulsate.

[dompie99]

As temp issues I think I had my share...One of the bloc I had was '' JB Welded '' between the water intake of the bloc and the Cyl No 6 grrrrrrrrrrrrrrr I discarted the bloc BUT I also checked the straightness of the mating surface of the Power-head / Mid section. It was slightly warped and not even.

had this taken to a machine shop and, for 20$, he resurfaced the mid. the over temp issue was way gone afterward.