150 force help jurking

[kboling]

ok i just got this thing and when im going in forward it jurks the hole boat douse iv had the lower unit checked he said every thing was good gears were in good shape checked my linkage every thing is good what could be bad? and its a 150hp 1989 a model ans i also put a new proop same story

 

[jason32038]

Re: 150 force help jurking

Maybe the houseboat is bad lol. How fast are you trying to get it to go?

 

[Frank Acampora]

Re: 150 force help jurking

If you mean that the engine is jerking and by that, it will thump with a bang while running, that is most likely a bad drive dog clutch and forward gear. The gears can NOT be checked without disassembling the lower unit. If they have broken teeth, they will skip and this can be felt by turning the prop with the engine in gear, but worn drive dogs can not be felt.

Here is a photo of generic gears and drive dogs. The squared-off bumps on the gear and the dog clutch still on the shaft mate with each other. If they are rounded from wear, the lower unit will bang as she skips out of gear. The whole boat will shudder and it will feel like it is going to come apart.

 

[kboling]

Re: 150 force help jurking

first off guy at top its not a house boat its a bass boat.. im just trying to get were im going and it douse trhis at full speed and pretty much every speed.. and the lower unit i had it took all apart buy a boat shop and he said all my gears were good he put it back together and same story thanks for your replies

 

[jason32038]

Re: 150 force help jurking

You said boat douse and I thought you meant boat house. Sorry man.

 

[Frank Acampora]

Re: 150 force help jurking

Assuming that the problem is lower unit related: The first thing that should have been checked was the shift linkage. If you have not done that, then do it now before trying anything else. It is possible to have the shift linkage adjusted so there is too much bias toward reverse and if that is the case, even good drive dogs will bounce out of engagement. Since adjusting takes a long time to describe, search for posts about shift linkage adjustment to learn how to do it. It is simple and you can do it yourself--no need to pay someone.

HOWEVER: You also say it happens at all speeds. Do you mean all higher speeds or everything from idle up to full throttle. That might indicate something else.

No disrespect, but you used the word douse for does and your post does not have punctuation. This caused a misunderstanding with Jason, who I believe tried to make a joke. I normally do not comment on peoples spelling or grammar if I can understand at all.

However: TO ALL POSTERS not just you.

The computer has spell check and grammar check. Using these does make it easier to understand you, and you are more likely to get a useful reply more quickly. At the very least, posters can google a word for correct spelling. I'm not too proud to admit that I do it all the time.

Remember: We are not face to face so we can not read each other's body language, making communication more difficult.

 

[kboling]

Re: 150 force help jurking

lol thanks ill give it a try. i cant spell to save my life eather damb you adhd!! And no it ideals smooth only in forward gear.. can you send me a link to ajust the cables and rod the right way

 

[Frank Acampora]

Re: 150 force help jurking

And, that's why I rarely comment: There may be an underlying reason.

Cables usually don't need adjustment.

As for the link, I have so many posts, I really don't know which it is. If you click on search at the top and then click on advanced search, you can enter adjusting controls and below that, my name. I have an answer to sharkhook on Feb 11 2008 which describes adjusting the linkage. Read through all the replies, not just the first one. perhaps search out another couple of posts.

While the posts may be specific for a particular engine, The 3, 4, and 5 cylinder engines all used the same midleg and lower unit. Everything from the bottom of the engine block down is the same. Therefore adjusting anything from an 85 up to the 150 is the same procedure.

It does sound at this point as if there is only a minor adjustment needed. However, understand that continued running with the lower unit popping out of gear will wear the drive dogs and they will then need either replacement or repair. If it has happened for a while, they may need repair at this time--you won't know until you try to adjust the shift linkage throw.

 

[kboling]

Re: 150 force help jurking

ok thank you

 

[havasuboatman]

Re: 150 force help jurking

Take the engine cover off and with one hand on the upper part of the power head, and the other on the lower unit try to push and pull the motor as if you were trying to tilt it up by hand. If the power head moves back and forth but the cowling isn't moving, the rubber motor mounts under the power head are broken.
When these mounts break, the symptoms are like you describe.
Replacing them requires the removal of the power head to access the top bolt (one on each side) The lower bolt (one on each side) is outside the cowling.