high rpm, little speed mariner 150 - Page 2

BarflyRIB · 14 March 2010, 08:54

I know the dealer took the tail off to place a new impeller... since then I have this problem...

biffer · 14 March 2010, 09:05

Quote:

Originally Posted by BarflyRIB

I know the dealer took the tail off to place a new impeller... since then I have this problem...

put it in gear and turn the prop by hand, then wedge a lump of wood between the prop and housing and try to turn the flywheel, you shouldn't be able to turn the flywheel i'm more inboard than out board but i know on some engines that the input shaft has a friction welded joint, i'm wondering if this is the case with yours and it's parted, you've going to have to take the gearbox off i fear to find out what this other guy has done

BarflyRIB · 14 March 2010, 09:10

just mention that getting it in reverse is also a trouble - only 1 on the 5 times it goes in.

biffer · 14 March 2010, 09:16

there's no way once it's in gear that it can slip as regards the gearbox, if you cant get reverse this sounds like another problem, i think it's time to take it back and complain

Chris · 14 March 2010, 09:26

Quote:

Originally Posted by BarflyRIB

I know the dealer took the tail off to place a new impeller... since then I have this problem...

Another example of a shite marine mechanic. How could any "professional" consider changing the impellor on an engine without running it up to check everything is working.

There really is only one option if you want the job done right.... DIY

biffer · 14 March 2010, 09:54

Quote:

Originally Posted by Chris

Another example of a shite marine mechanic. How could any "professional" consider changing the impellor on an engine without running it up to check everything is working.

There really is only one option if you want the job done right.... DIY

that's ok if you know what you're doing or you even own a spanner, some people don't

BarflyRIB · 14 March 2010, 18:22

tested today, I can turn the prop with very little resistance while the lever is in WOT position... not normal I think so
In reverse, I cannot turn the prop.
In neutral, it spins around, OK

is it normal that you cannot turn the drive shaft by hand?

I have a thought that the clutch or the clutch springs are end of life...

Nos4r2 · 14 March 2010, 18:49

Quote:

Originally Posted by BarflyRIB

I have a thought that the clutch or the clutch springs are end of life...

It doesn't have clutch in that sense. It's a dog clutch.

It may be that it's not going into gear at all?

BarflyRIB · 14 March 2010, 18:56

Quote:

Originally Posted by Nos4r2

It doesn't have clutch in that sense. It's a dog clutch.

It may be that it's not going into gear at all?

so it could be just a simple throttle cable setting?...

Nos4r2 · 14 March 2010, 18:59

Quote:

Originally Posted by BarflyRIB

so it could be just a simple throttle cable setting?...

Not throttle cable, gear cable. However, if it is the problem, you'd hear some nasty grinding noises from the gearbox...

biffer · 14 March 2010, 19:02

can you feel it jumping or banging through the engine, would indicate that it's not going into gear properly, you could get out in the water, remove the gear shift cable and put it in gear by hand and try it, make sure you're not near anything

Nos4r2 · 14 March 2010, 19:09

Quote:

Originally Posted by biffer

can you feel it jumping or banging through the engine, would indicate that it's not going into gear properly, you could get out in the water, remove the gear shift cable and put it in gear by hand and try it, make sure you're not near anything

I'd second that-but I'd take an auxiliary with you as well if you don't usually carry one. If it is the problem, you may be close to having ground your gearbox to swarf after using the boat like it previously.

BarflyRIB · 15 March 2010, 07:06

so it's possible that the prop spins when the gear shaft settings are not correct, so high rpm and less speed, like you said not getting into gear properly

BarflyRIB · 25 March 2010, 08:35

to complete the history, went today to dealer for test ride

there are 2 ignitions not working and the lower unit had to be opened up to check gears, clutch, etc

BarflyRIB · 05 April 2010, 15:02

power packs need to be replaced, stator is fine and maybe lower unit to repair BUT when power pack is dead, it's kind of normal of losing power and getting the boat not anymore in plane, no? if this is, maybe the lower unit is still OK

9D280 · 05 April 2010, 15:11

If you have cylinders not working then yes, you will loose a proportinally high amount of power and speed (e.g if you have 3 cyls and one is dead, you lose more than 1/3 power, becasase the working cylinders still have to compress the mix in the dead cylinder but get no payback as the fuel doesn't burn to produce power)

Dog clutches on outboards are a bit "digital" in as much as they should either be in or out of gear. Halfway will make a lot of nasty noises and you would definetly know about it!

If it's with a dealer then you should get a working engine back.

BarflyRIB · 05 April 2010, 16:40

Quote:

Originally Posted by 9D280

If you have cylinders not working then yes, you will loose a proportinally high amount of power and speed (e.g if you have 3 cyls and one is dead, you lose more than 1/3 power, becasase the working cylinders still have to compress the mix in the dead cylinder but get no payback as the fuel doesn't burn to produce power)

yes indeed, first of all replacing the power packs and then we see further!