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Prop continuity washer

J

JOHNSON1102

Member
On the Mercury 150 hp I put the thrust washer on the right way then prop goes on but the splines on the prop shaft don’t reach the continuity washer. Anyone else have this problem?
 
This is the continuity washer, I don't think you have the correct nomenclature for your issue.
Over the years, Mercury changed thrust hubs, prop hubs & attaching hardware.
Post a picture.
 
Right wrong description the washer has provision for a locking tap washer that goes on top of it and you bend the tabs over to lock it in and put the nut on and tighten down.
 
There were 2 old style tab washers that lock into a "castle" washer.
Early had straight tabs & was quite heavy duty, later had 90 degree bends on tabs with holes. Both are interchangeable. Here is picture of later tab washer.
1782602127893.jpeg
 
I'm assuming you have an older (80s/90s) motor & are installing a different prop than you took off.
If so & you removed an OLD style prop and are installing a new style, different thrust hubs are required.

Post pictures of the gearcase end of props & prop thrust hub/hubs.
 
It won’t let me upload my photo from my library. But I put this motor on the boat it’s a 1999 150 hp Mercury brought it with no prop , I have the old style lock tab washer on it now , like I said before the washer sits on top of the prop not into the splines I have the nut on it tighten and the tabs bend down onto the washer. Will this be ok. And Thank you for responding!
 
No, the castle washer must lock onto the splines or else you will end up propless. It happened many times during the transition from old style props to "Black Max" style.
I suspect you have an old style thrust hub (not used on production motors after about 1983/1984 but easily installed if installing an old style prop) on that motor and are trying to install the "Black Max" (about 1984 & later) style prop.
 
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Later "Black Bax" style. Still used on current production units.
Old style pictured above is bronze with a stainless washer.
"Black Max" style is 1 piece, not sure of material. Only about 1/2 to 2/3rds as thick as the old style.
1782606033647.jpeg
 
Ok I checked the thrust washer it solid wit a lip fits perfectly on back of prop. Took thrust washer off and put prop back on to see if it seats lower to get more of the splines to show but still the same, flush with top of prop no splines for washer to catch! So I got a lower unit that does not belong on there ? I just brought the motor from this guy that rebuilds them! Did I get a bad motor? Not happy now!
 
This is everything required for the "Black Max" style prop. If earlier, then the earlier thrust hub is required. Really need pictures of prop from both ends & of your hardware. Try posting again. Maybe downsize the images.
1782607526609.jpeg
 
What you show is what I have exactly ! I may have wrong hardware perhaps. Guy said motor is a 1999 150 hp Mercury has salt water series on cover. I will try and post the photo again .
 
I assume your "1999" motor is a V-6 2 stroke?
If yes, then it is the 4 3/4" gearcase & uses the same props & hardware as a Mercruiser.
All I can tell you is I have all the different hardware going back to 1963 Mercruiser sitting at home.
 
Doesn't that prop have the removable splined sleeve & plastic or hard rubber squarish hub?
Like this picture? Some early removable hubs had the center sleeve with the "Castle" style. Later ones (probably over 16 years now) used the flat locking washer type as shown. BTW, it's QA1912X
1782609014327.jpeg
 
So that gray piece is inserted into the black piece that has the splines that go into the center of the prop . What I have it appears to be one piece that goes into the center of the prop! Thanks again
 
Ok, follow closely:

*Does yours have the 2 pins as pictured or the castle style center sleeve? Pins/Castle?
*Does the metal sleeve slip in easily? Yes/No?
*Does the black center hub come out easily? Yes/No?

The black hub is designed to fail if it clobbers something hard enough.
Once it begins to fail the center sleeve gets stuck or at least hard to remove.
Also, there is a front & back to the plastic hub. Loom closely, it has a flight taper. Goes in with the rounded edges 1st. When it is fully in, the thrust hub will touch the aluminum of the prop along the "step down" of the thrust hub. IF THE PLASTIC HUB IS INSTALLED BACKWARDS IT WON'T GO IN FAR ENOUGH.

If yours has the 2 pin style, then the "castle" washer is not used. You will use just the flat tab washer with the "key holes" to lock onto the pins.
 
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