1987 Chrysler Force 50 (507X7B) - overheated/dead & need to fix

[emoney]

Re: 1987 Chrysler Force 50 (507X7B) - overheated/dead & need to fix

Just don't lose sight of the fact that IF you did in fact spend $200 on your motor, you now at least know what you have. Anytime you buy a used motor, there's no way to know "what's what" until after you get it home. It it were me, and I wanted to get back on the water sooner, I'd probably buy the Force for $400 and save the one I had for spares. If I wasn't in such a hurry, I'd definitely repair mine. Are you 100% confident with your compression numbers? I know you've used 2 testers, and don't let this be offensive in any way, but are you comfortable in doing a compression test? I only ask because I remember back in the day the first time I did one and had horrible numbers. I mentally gave up on the motor and then a friend that was a mechanic did it and my 40lbs of compression turned into 110 overnight, lol.

There's only so many parts you can replace before its "new", if that makes sense. Good luck and keep us posted.

 

[Evinrude_NooB]

Re: 1987 Chrysler Force 50 (507X7B) - overheated/dead & need to fix

I completely agree on your point about buying a used motor. That was exactly what happened. I bought the boat and on the first run, it blew.

In regards to my compression testing. I'm NOT taking any offense. Although I did test on two tester, one being new. I cannot say for certain that the equipment is correct. My testing procedures were pretty consistent though:

1: Take out both plugs

2: Connect compression tester to a cylinder

3: Using a freshly charged battery and jumper cables, I connect the (+) of the battery to the (+) of the starter motor, bypassing the solenoid.

4: Then I touch the negative jumper to one of the ground bolts on the starter motor.

5: I stop cranking when the compressions number stops going up.

6: Repeat for the other cylinder.

 

[emoney]

Re: 1987 Chrysler Force 50 (507X7B) - overheated/dead & need to fix

TIghtening the pressure plug on the tester itself? The "air nipple" if you will?

 

[Evinrude_NooB]

Re: 1987 Chrysler Force 50 (507X7B) - overheated/dead & need to fix

I just hand tighten the tester to the plug ports. That should be tight enough, isn't it?

 

[emoney]

Re: 1987 Chrysler Force 50 (507X7B) - overheated/dead & need to fix

I'm talking about a pressure relief valve. On the one I have, it's a little screw that when your done with say the top cylinder, you release all the air and then after it's inserted into the next plug, tighten that valve back then do the test. I've seen others that had a "button" that you pushed.

 

[emoney]

Re: 1987 Chrysler Force 50 (507X7B) - overheated/dead & need to fix

See the button right next to the "nut" below the gauge itself on this one?

Wow, that' a big picture, lol.

 

[Evinrude_NooB]

Re: 1987 Chrysler Force 50 (507X7B) - overheated/dead & need to fix

Yeah, thought that might be what you mean, but wasn't 100% sure.

I checked the relief valve on both testers. On the Snap-On, I made sure it was tighten. On the new one I bought, it was round so I wasn't sure how they got the little stem in there. I could see the screw thread inside so I was sure it was screwed on. I tried tightening it more but it was already tighten.

 

[Evinrude_NooB]

Re: 1987 Chrysler Force 50 (507X7B) - overheated/dead & need to fix

That picture of your tester looks just like the Snap-On I borrowed from my neighbor.