reverse knocking

steplift20 · #1 05-07-2006, 10:39 PM

took my boat out today and ran great except when i put it in reverse the motor would bang sometimes like it was slipping in and out of gear
anyone know what that could be
I have a 1988 150 mercury o.b it never did that before
is a loud bangging noise

msbhammer · #2 05-07-2006, 11:59 PM

I have a Merc. 200 Black Max.
Let me know what you find out.

reelapeelin · #3 05-08-2006, 08:48 AM

Better have it looked at soon...sounds like one of those things that could cause more damage if not fixed ...could be a bad ''clutch-dog''... ::)...

phester · #4 05-08-2006, 09:45 AM

that happened to a Mercury I had, the forward and reverse gears were fine but on the back of each gear are the clutch dogs, and in forward, just a bit over idle speed it sounded and felt like I was driving the boat over a bunch of rocks....not a good feeling. Step20, I hope it's the case, but , if it is, you already need a lower unit [ the reverse gear, that is]

Airslot · #5 05-08-2006, 10:03 AM

I've got the same 88' merc 150. Drain your lower unit lube and look for metal particles / chunks. The bottom screw is magnetic so you may have some gunk stuck to it. When my lower went bad, I caught it before it "blew", that gear lube looked like it had glitter in it.

Good luck,

Airslot

Stinky_Hooker · #6 05-08-2006, 10:08 AM

It is possible the linkage is off and its not going FULLY into reverse?? They will knock in that situation.

Remember, think simple..FIRST. ;D

phester · #7 05-08-2006, 10:13 AM

your right Stinkman, I would check the lower unit oil like Airslot said, then look at the linkages and cable adjustment for the reverse....hopefully the damage has not already been done

macojoe · #8 05-08-2006, 11:06 AM

yep oil then linkage

phester · #9 05-08-2006, 11:29 AM

Quote:

Originally Posted by phester

that happened to a Mercury I had, the forward and reverse gears were fine but on the back of each gear are the clutch dogs, and in forward, just a bit over idle speed it sounded and felt like I was driving the boat over a bunch of rocks....not a good feeling. Step20, I hope it's the case, but , if it is, you already need a lower unit [ the reverse gear, that is]

ooops, sorry Step, I meant to say " I hope it's NOT the case"....good luck

steplift20 · #10 05-08-2006, 01:04 PM

how do you check the lincage
because i clean the motor this year[should have left it dirty] and it seemed hard going in reverse and then the banging

so i thought mabe i have to put grease somewhere but where