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Old 10-10-2005, 02:41 PM
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Default Yamaha F115 Timing Belt

I'm almost ready to buy a 2003 Pursuit with Twin Yam F115's. I expect they will need Timing belts soon. Does anyone know what is involved in replacing them? I have many years experience replacing automotive timing belts, my question is does this job require any special tools, besides a flywheel puller? I know some European automobiles (Porsche) require special tension guages that cost a fortune. I tried to get a service manual from e-bay, but I don't see any available for this particular year right now. Also, do these motors use a "Propriatary" computer interface/software, or is it simple like on my 2003 Suzuki DT 225 which sends codes directly to the tach/monitor? Any advice would be welcome.
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SZ
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Old 10-10-2005, 03:15 PM
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Default RE: Yamaha F115 Timing Belt

SZ,

Besides a flywheel puller there are no there special tools required to change the belt. Yamaha specs I think every 500 hours of service for replacement.

Yamaha uses a laptop software setup for diagnosing there ECU's and related functions. It is called YDS (Yamaha Diagnostic Software). No other way to pull that info off the ECU like you can with your Suzuki.

Yamaha OEM service manuals and the other partsmentionedare available from.......... I can't say on this forum. But I would suggest clicking the link in my signature

Andy
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Old 10-10-2005, 05:46 PM
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Default RE: Yamaha F115 Timing Belt

Thanks for the quick reply! I just ordered the manuals. Are there any "issues" I should know about on these engines? They have 325 hours and my THT searches yield generally positive results.
Thanks in advance,
SZ
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Old 10-10-2005, 06:07 PM
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Default RE: Yamaha F115 Timing Belt

SZ,

Makes sure they pull rpms above 5500 and that they are close to each other rpm wise at WOT. If you had YDS you could pull the rpms usage off the ECM along with the ECM hours.

Other then that...no major tech issues and no recalls. Pretty solid engines in my experiences.

Email me the primary ID numbers if you have them and I can run them through the system.

Andy
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Old 10-10-2005, 08:02 PM
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Default Re: Yamaha F115 Timing Belt

out of curiousity, do you have to change the timing belt in every 4 stroke yam at 500 hours?? about how much does this cost for a yam technician to do this with parts?
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Old 10-11-2005, 08:53 AM
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Default Re: Yamaha F115 Timing Belt

Quote:
intreppy345 - 10/10/2005 7:02 PM out of curiosity, do you have to change the timing belt in every 4 stroke yam at 500 hours?? about how much does this cost for a yam technician to do this with parts?
Suggested retail for the belt is $100 and some change. Off the top of my head I don't know what the Yamaha laborflat rate is for that, but if I had to estimate I would guess two hours at the most as long as the flywheel "pops" off with little or no problem.

On another thread I posted on a F225 that Yamaha recommends every 1000 hours or 5 years on the timing belt replacement. They are non interference engines meaning if the timing belt let go the pistons could not hit the valve train and trash the valves, heads or pistons. The F115 and F150 are interference engines meaning if the belt were to fail there most likely would be major internal damage from parts colliding with each other. Therefore I would split that time in half and change them out at 500 hours.

Andy
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Old 10-11-2005, 01:40 PM
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Default Re: Yamaha F115 Timing Belt

Thank's for that imfo Andy. No one would ever say that before about the non interference/interference engines.

FYI I'm getting closer to hanging the motor's. The bracket has been blasted to etch the alum and primed.



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Old 10-11-2005, 09:52 PM
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Default RE: Yamaha F115 Timing Belt

Quote:
SIM - 10/10/2005 12:15 AM



SZ,

Besides a flywheel puller there are no there special tools required to change the belt.
On the Merc version of this same engine, you need a special holder to keep the flywheel stationary while you loosen the flywheel nut. you may be able to omit this tool if you use a 1/2" impact gun but its going to be tough to remove the flywheel without some means of holding it stationary.
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Old 10-12-2005, 08:41 AM
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Default Re: Yamaha F115 Timing Belt

Bobby,

Looking good I bet you are getting anxious !



You can buy special tools till you are blue in the face. Someone that would attempt a timing belt replacement I hope would have enough common sensemechanical abilty to know to use a 12 or 34"" impact to buzz of that nut. This is not the preffered way but if they do not have one and in a pinchyou can always remove the spark plug leads, put the engine in gear and insert a block off wood between the prop and gear case. The impact works much better.

This was not meant to be a "how to do it"thread. I don't think that most F115 owners would nto attempt a Timing Belt replacement anyways.

Andy
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Old 10-12-2005, 08:54 AM
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Default Re: Yamaha F115 Timing Belt

Quote:
SIM - 10/11/2005 5:41 PM



Bobby,

Looking good I bet you are getting anxious !

*

You can buy special tools till you are blue in the face. Someone that would attempt a timing belt replacement I hope would have enough common sense*mechanical abilty to know to use a 12 or 34"" impact to buzz of that nut. This is not the preffered way but if they do not have one and in a pinch*you can always remove the spark plug leads, put the engine in gear and insert a block off wood between the prop and gear case. The impact works much better.

This was not meant to be a "how to do it"*thread. I don't think that most F115 owners would nto attempt a Timing Belt replacement anyways.

Andy
all true but lots of do-it-yourself guys don't have or use pnuematic impact tools at home like we would in the shop. regardless, i see your point.
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Old 10-12-2005, 09:09 AM
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Default Re: Yamaha F115 Timing Belt

Bob,

I re-read my post there........hope it did not come off as sarcastic towards you. Probably should have used a smiley face or two.

Andy
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Old 10-12-2005, 01:30 PM
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Default RE: Yamaha F115 Timing Belt

Quote:
SIM - 10/10/2005 6:07 PM



SZ,

Makes sure they pull rpms above 5500 and that they are close to each other rpm wise at WOT. If you had YDS you could pull the rpms usage off the ECM along with the ECM hours.

Other then that...no major tech issues and no recalls. Pretty solid engines in my experiences.

Email me the primary ID numbers if you have them and I can run them through the system.

Andy
What do you me when you say "pull rpms above 5500"? The reason I ask is because I have twin F115's (05 I think) my max out at 5800.




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Old 10-12-2005, 01:37 PM
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Default RE: Yamaha F115 Timing Belt

All engines regardless of brand or type are supposed to be propped so the engine runs at WOT in the manufactures reccomended rpm range. On a F115 it is 5000-6000 rpms. To be more specific concerning a Yamaha.....they like to see there engines in the upper end of there rec ranges. So when I posted "make sure they pull above 5500 rpms" I was letting SZ know that if they did pull above 5500, they are propped correctly and most likely if they both pull the same rpms probably are OK and should have no real majorissues.

btw...........Your F115 is perfectly propped. 5800 at WOT

Andy
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Old 10-12-2005, 08:33 PM
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Default Re: Yamaha F115 Timing Belt

If you don't have an impact wrench get one--they are dirt cheap-- and save lots of knuckles!! and stop you from saying bad words
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Old 10-12-2005, 10:03 PM
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Default Re: Yamaha F115 Timing Belt

Thanks Andy.

Mark W.
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Old 10-13-2005, 12:38 PM
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Default Re: Yamaha F115 Timing Belt

I wish someone knowledgeable would post the directions,,,,,,BEFORE I need to do this to my F115. Obviously plan to DIY.
Just make sure that impact wrench is set for the right direction before pulling the triger, and that the bolt is right/left hand thread
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Old 10-14-2005, 09:40 AM
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Default Re: Yamaha F115 Timing Belt

i am ommitting some obvious steps (for brevity) but here are the "basic" steps in the process:
1. remove spark plugs
2. line up all timing marks on the belt pulleys (critically important)
3. remove flywheel with a 1/2" pnuematic impact gun. if you must use hand tools, use a 1/2" breaker bar with a 6 or 12-point socket and use the special flywheel holder tool. you need this as the flywheel will turn when you try to loosen the flywheel nut. if you are too cheap or otherwise don't want to buy the holder tool, use a block of wood but do so at your own risk.
4. remove flywheel utilizing the special flywheel puller tool
5. remove belt tensioner(s)
6. remove belt and place new belt on pulleys correctly orienting it with the direction marks (arrows) marked on the belt. reverse the above steps to re-assemble.

READ YOUR MANUAL to get all the fine detailed steps i have ommitted....if you still don't think you have a good grasp on the job, let your local outboard mechanic do it for you. the above steps are by no means complete, just a quick down and dirty on how the process goes. you don't have to be a master mechanic to change your timing belt and you will get a ton of satisfaction from doing it yourself. Re-read step #2 a couple of times and ensure you don't ommit that or you will damage your new engine when you go to start her up after installing the new belt.
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