Mercury SportJet 175 problem

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Mr. Wilson

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I just bought a used 2000 NR with Mercury Sport Jet 175 Serial#0E371792. It has 170 hours on it. I've put 2 hours on it with no problems. It starts with 1st turn of the key, idles great & runs smooth.

Put gas in it the other day for the first time with no mixture (since it is oil injected), then took it out last night and it ran fine for 2 miles, shut it off to use the kicker and when I tried to start it to head for the dock, it wouldn't turn over, won't even try to crank. Thought the battery was dead, had it tested today and it's at full charge. Then thought it might be the starter, but it also tests good. Took out the spark plugs and water came out the bottom plug on both sides. When I hook up the external water source, it flows out of the bottom cylinder as fast as it goes in. There was no indication that I had a problem until it wouldn't start (no alarms sounded and it ran great).

Is this a blown head gasket or do I have a cracked block, what could it be?? I should get an alarm if it was overheating and I didn't.

Also, I know there were problems with the plastic oil injection pump gear and there may have been a recall on this part, how can I find out if there is a recall on the part on my motor?

If it is the head gasket, and I replace it, what other precautions should I follow before starting the motor?

Howcan I check that my oil injection system is functioning properly?

Hydrolocked maybe? What should I do before trying to start it to not cause more damage?

Your advice is much appreciated!!! THANK YOU!!!
 

JustJason

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Aug 27, 2007
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Re: Mercury SportJet 175 problem

This needs to be put in the OB section... but....

You need to do a leakdown test.... Those cylinder heads are pretty light. They don't take well to an overheat. And they are pretty easy to warp.
 

Don S

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Re: Mercury SportJet 175 problem

Moving to Mercury Outboard forum
 

Mr. Wilson

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Re: Mercury SportJet 175 problem

Don't know why this got moved. The 175 Sportjet is an INBOARD motor. Any thoughts on my issue though???
 

Mr. Wilson

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Re: Mercury SportJet 175 cracked block??

Re: Mercury SportJet 175 cracked block??

If it were a cracked block, would the water be able to leak into the cylinders on BOTH sides?? How could it do that?
 
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