150 tear down

[Benny1963]

looking for oem reprint 1983 150 crossflow
i am fixing to tear down my 150 looking for ticking noise
any tips on cleaning and keeping piston and bearing *** / seperated
and soforth on tear down would be great
going to be taking good look at all bearings .
prob was not under flywheel or at top bearing
bennyb

 

[R.Johnson]

Re: 150 tear down

You are going to need the factory service manual for this job, there are to many things to over-look without it. You will need more than just a few tip's from this board.

 

[Gary H NC]

Re: 150 tear down

Hey Benny,You need a factory service manual.It will pay for itself over and over.
Check out this Ebay link,Its for a 1981 but email the seller,his name is John,ask him about a 1983 manual he probably has one.You can tell him Gary from NC sent you.He will fix you up..

"http://cgi.ebay.com/ebaymotors/1981-150-175-200-235-JOHNSON-EVINRUDE-SERVICE-
MANUAL_W0QQcmdZViewItemQQcategoryZ26453QQihZ024QQitemZ370007145175"

 

[Joe Reeves]

Re: 150 tear down

Benny.... Before tearing into that powerhead, run the engine on a flushette and using either a mechanic's stethoscope.... or a long screwdriver that you can hold the screwdriver handle to your ear, check to see if that noise is a chipped gear tooth in the lower unit.

The screwdriver trick, if a stethoscope is not available, will amplify the noise from the screwdriver tip thru the handle to your ear.

Noise such as this being generated in the lower unit will travel up the driveshaft and actually sound like a wrist pin problem etc.

 

[Gary H NC]

Re: 150 tear down

Sorry TD for the direct link,forgot the quotes!

HAPPY NEW YEAR!!

 

[Benny1963]

Re: 150 tear down

thanks everyone .will get factory reprint .
i have lower unit off and the motor running at this time with hose strait to
the power head supply its still ticking its high on motor checked stator and top bearing , no noticible play on any piston checked with heads off
power head has about 60 hrs .
thanks bennyb happy new year

 

[Dhadley]

Re: 150 tear down

The powerhead has 60 hours on it? Can we assume it was rebuilt recently? If so what pistons did you use? Who bored it?

 

[Benny1963]

Re: 150 tear down

block was done by local machine shop /power head done by local boat repair
25yrs in buisness /lower unit is off and it is running on water supply to power head via supply tube and water hose /tick is high om motor
there is a little play in the pistons side to side .the tick sounds high on motor with screw driver .pulled flywheel but havent pulled top bearing .
there is no side to side play at bearing and no up and down play .
comp is around 115 on all cyls dry kinda high probaly due to head machine work it was around 105 .this boat has set for quite some time .
so there is no warranty .called mech he said probaly a wristpin bearing at that time i asked him if he changed all bearings he said yes that he used a kit
he wants 600 and parts to tear down and repair .
i can buy running xp 150 for that .but whose to say it wont have issues .
happy new year Bennyb

 

[Dhadley]

Re: 150 tear down

OK, we need to know what brand pistons were used. It's very important. We also need to know what they used for a finished bore size. There may be no need to pull it down.

 

[Benny1963]

Re: 150 tear down

dont have that info i taked to the man that built it . but it has been three or four years . the boat sat until i got it the mech said he couldnt remember who he was getting his parts from .at the time .the man at the machine shop .also said he couldnt rember working on that part block .
so all i know is from removal of heads that they are 030 with no markings other than that. should i pull heads back off and mike cyls while its assembled.i still havent pulled top bearing . it seams really tight .
right know its assembled and running .
thanks tthanks mr hadley .
bennyb

 

[Dhadley]

Re: 150 tear down

Did the noise start after an overheat?

 

[Benny1963]

Re: 150 tear down

yes that when it became noticable i had water on top cyl and warped head on same side top cyl.sure sounds like its in top bearing when i use steth
but there is also a rod up there.will take what ever steps necc to diagnose
thanks Benny b

 

[Dhadley]

Re: 150 tear down

You can check bearings with a screwdriver. With the plugs out bring the piston to top dead center. Slowly move the flywheel (clockwise) by hand bringing the piston past TDC. Hold the flywheel and gently push on the piston with the screwdriver. There should be no play whatsoever. If you push with the screwdriver the flywheel should want to move. If you move the flywheel, the screwdriver should move.

If you have a bad bearing, either rod or wrist pin - or a loose pin, you'll feel some play.

With a slight overheat it's not unusual to get some piston skirt collapse. That will cause some ticking noise at low rpm's. Since your overheat was severe enough to warp the head(s), it wouldn't be unusual to find you have some piston skirt damage.

 

[Benny1963]

Re: 150 tear down

probaly be safe to say that i might as well tear down and have pistons and
cyls checked do you think i will be able to save any of the pistons
would probaly be worth repairing if i only had to replace and bore one or two
thanks bennyb

 

[Dhadley]

Re: 150 tear down

Once you get it apart, have a marine machine shop measure the bores. Then, and only then, see how the pistons measure up if there are any good cylinders. They'll measure for out-of-round as well as for wear.

Remember, use a marine machine shop, not an automotive machine shop.