9.9 gamefisher power loss/blowhead

[Dale Milne]

I have a 9.9 game F. that ran great and got me up on plain for about 3-4 min. then it would gradualy slow down to just putting along. Head pressure was 90/95. I had a shop check it and they could not find the problem. I got it back and it ran for about 5 min. then died and would not start back up. Now head is definetly blown. and I have some water specs on the plugs. oh, I changed the lube and ran the motor for an hour befor I toke it to the shop. They check the lube and said it was a little frothy and questioned water in it. How does all this tie together? Is it possible that I had a very small head leak that has been my prob. the whole time and that water was getting by the rings and into the case?(not much water in there but some) thanks for any help you can offer.

 

[Yepblaze]

Re: 9.9 gamefisher power loss/blowhead

Let me see here; you say,<br /><br />"up on plain for about 3-4 min. then it would gradualy slow down to just putting along"<br /><br />Lack of fuel delivery to carb? Check or replace all connectors on fuel line, clean or replace any fuel filter, check fuel pump performance, check for debris in float bowl clogging jets.<br /><br />Partial piston siezure taking place? Make sure you have the fuel/ oil ratio correct.<br /><br />Overheating? If the motor is becoming too hot it will lose power, make sure the water pump is operating properly, and the motor powerhead block is not too hot to be able to touch it for a second or so without getting burned. Paint blistering or burning away will definately depict an overheating problem that would encompass the loss of power.<br /><br />"I got it back and it ran for about 5 min. then died and would not start back up."<br /><br />Was that a fuel, compression, or ignition related failure? <br /><br />When that happens try removing the spark plugs, spin the motor and look for spark at the plug(s) squirt a half a teaspoon of fuel mix in each hole, replace plugs and try to start it. Did it fire off? That was a fuel starvation problem if it did.<br /><br />" Now head is definetly blown. and I have some water specs on the plugs"<br /><br />Your terminology is a bit vague here. Perhaps you believe the head gasket to have failed at this point. Perhaps that is the case. Remove the head and clean and check surfaces then replace gasket per specifications in the repair manual. <br /><br />"They check the lube and said it was a little frothy and questioned water in it"<br /><br />It will appear frothy after being "in use" and may take a day or more to settle out water or float out air in the lube before a visual test of the oil can be done acurately.<br /><br />"Is it possible that I had a very small head leak that has been my prob." <br /><br />Head leak? Again I believe you want to say head gasket leak, and yes that may be just one of the issues you need to deal with on this motor.<br /><br />"the whole time and that water was getting by the rings and into the case?"<br /><br />Not likely.

 

[Backlash]

Re: 9.9 gamefisher power loss/blowhead

Don't believe that engine has a head & head gasket. You may have a leak in the water jacket/gasket though. That would account for the evidence on the spark plugs. Thoroughly check the fuel delivery system before going any further.<br />Backlash

 

[Dale Milne]

Re: 9.9 gamefisher power loss/blowhead

when I first got the motor two months ago it did over heat. I smelled a burning rubber smell and then the motor shut down. it would not start for about 20 min. Then I was abel to get it started again. The power lose was evedent right away before I smelled the rubber burning. I got on plain for 2-3 min then it gradualy slowed down it ran like that for 4-5 min befroe i had the shut down. I check the head presure and it was at 90/95 and then replaced water pump, housing and lower seal. It ran nice and cool the next time out. It ran for 2-3 min on plain the slowed again. However, I putted around the lakee for an hour and the temp nevr got more then bath water. I took it to the shop and they said the filter in the fuel pump was cloged and that was my problem. Presure still 90/95(70 bucks for this). I got out on the lake but it would not get up on plain at all this time. It ran for 3-5 min then it felt like I bumped bottom and the motor just stoped. I could not get it started at all after that. I took it back to the shop and they said now my head presure was 80/40. what I am wondering is could there have been a small leak in the head gasket that only showed up after a few min of running(got warm) and caused my power loss? Is there just one water jacket gasket?

 

[Yepblaze]

Re: 9.9 gamefisher power loss/blowhead

During an overheat and subsiquint(spelling?)<br />seizure to stop... The piston will lose some of it's aluminum to the cylinder bore. At some time in the future if it is gotten running again this can lead to more piston siezures even when operating temps are at what could be considered normal. Usually this will effect the piston ring sealing and will show during a compression check. (but not an absolute)<br /><br />Why did it show good compression after the initial overheat and now show poor compression is an unknown at this point and could only be guesses on my part.<br /><br />If it does have good compression and still exibiting loss of power as it did before the fuel filter was cleaned or replaced (and fine afterwards) may indicate the filter is clogging repeatedly and may require more changeouts or cleaning cycles of the filter till the clogging agent gets filtered out or maybe a change out of the fuel, container, fuel line, and filter, along with any other item effected by the clogs, ie: carb and jets, fuel pump, may need to be repeated.<br /><br />But that being said. If it was overheated to the point where it stalled and stopped turning till cooled. I would suspect cylinder and piston damage that would be best accessed by a professional.

 

[Dale Milne]

Re: 9.9 gamefisher power loss/blowhead

every time it has shut down I could turn the motor over by hand. I may be completly wrong but I think the shut down is caused by something else. If it seized wouldn't the motor have locked up? It is just afully coincedental that I have the power loss problems then blow the head gasket. I don't know how they would be related though.

 

[Solittle]

Re: 9.9 gamefisher power loss/blowhead

Don't know the Gamefisher but seems that it is time to get inside those cylinders & take a look. You described a motor that overheated pretty badly and you ran it for a considerable length of time afterword on a couple of occasions. When they get real hot the metal from the rings, pistons and cyl walls do all kinds of wierd things that rusults in the motor binding. It may not be frozen, you can turn it over by hand when it cools down, but the inside of the cylinders are a mess. Note compression goes from 90/95 to 80/40. The 40 ain't good.