Yamaha 15F 2-stroke. Purchase, check & Service. - Page 4

beamishken · 30 October 2019, 08:57

Makes me laugh when people Discourage preventive maintenance with the aint broke dont fix it attitude.
This engine maybe didnt need stripping however now having been apart you can be sure that if it does need to come apart that it actually will come apart & you wont snap every bolt on the way.
If someone is competent & knows what there doing they certainly wont make things worse.
There is a huge difference between part time tinkerers who arent confident something will run the same after they strip it and those who can strip something and be 100% confident it will run as it should.

smallribber · 30 October 2019, 09:05

Quote:

Originally Posted by beamishken

Makes me laugh when people Discourage preventive maintenance with the aint broke dont fix it attitude.
This engine maybe didnt need stripping however now having been apart you can be sure that if it does need to come apart that it actually will come apart & you wont snap every bolt on the way.
If someone is competent & knows what there doing they certainly wont make things worse.
There is a huge difference between part time tinkerers who arent confident something will run the same after they strip it and those who can strip something and be 100% confident it will run as it should.

It makes me laugh when people strip down things that are working perfectly and justify it with the term Preventive Maintenance. Being a Chartered Surveyor I have seen Hundreds of Millions of pounds spent on totally unnecessary work justified by the old PM label.

If something might snap later why would it not snap now.

You don't like 'if it aint broke don't fix it'. How about if it aint broke don't break it

When did you last take your car engine to bits or remove your tyres to polish the inside of the rims

beamishken · 30 October 2019, 10:01

Quote:

Originally Posted by Bigplumbs

It makes me laugh when people strip down things that are working perfectly and justify it with the term Preventive Maintenance. Being a Chartered Surveyor I have seen Hundreds of Millions of pounds spent on totally unnecessary work justified by the old PM label.

If something might snap later why would it not snap now.

You don't like 'if it aint broke don't fix it'. How about if it aint broke don't break it

When did you last take your car engine to bits or remove your tyres to polish the inside of the rims

We've all seen your maintenace posts BP & its pretty obvious you fall into the tinkerer whos likely to make things worse category.
Carry on with your fix it when its broke strategy im sure it works for you most of the time.
And yes I do take my car engine apart for maintenance from time to time, its called servicing. And whilst I dont take my alloys off I know plenty people do, a good detailing shop will do it for you if your not competent to put the wheel nuts on tight enough.
If you have time and ability then why not do some maintenance obviously the anode buried in the engine is intended to be changed periodically & being opened up every few years an engine is far likely to come apart without a dozen snapped bolts than one thats 20 yo & never seen a spanner
Your also doing it wrong if you run your car engine with salt water in the cooling system!

Fenlander · 30 October 2019, 10:25

I'm fully aware no one poster, even if the OP, can't control a thread but please guys on both sides don't dilute this thread with a massive for/against maintenance argument or it undermines its potential as a resource of info for others in the future.

Ferryman · 30 October 2019, 11:38

Some people are engineers not surveyors.......just saying

jeffstevens763@g · 30 October 2019, 11:39

Quote:

Originally Posted by Fenlander

I'm fully aware no one poster, even if the OP, can't control a thread but please guys on both sides don't dilute this thread with a massive for/against maintenance argument or it undermines its potential as a resource of info for others in the future.

well said david.
i guess thats why new folk ask the same questions because they dont want to wade through the sh-te on threads.

Max... · 30 October 2019, 13:11

Err, hands up who you would rather buy a used engine from?

1). Fenlander.
2). BP.

Hmmm...???

beamishken · 30 October 2019, 14:32

Quote:

Originally Posted by Fenlander

I'm fully aware no one poster, even if the OP, can't control a thread but please guys on both sides don't dilute this thread with a massive for/against maintenance argument or it undermines its potential as a resource of info for others in the future.

I hear what your saying but people reading realy shouldnt be encouraged to take the fix it when its broke approach to maintenance

Pikey Dave · 30 October 2019, 14:39

Quote:

Originally Posted by beamishken

I hear what your saying but people reading realy shouldnt be encouraged to take the fix it when your mate’s towed you back to shore again, approach to maintenance

FTFY [emoji57]

beamishken · 30 October 2019, 15:29

Quote:

Originally Posted by Pikey Dave

FTFY [emoji57]

Bilges here we come[emoji26]

smallribber · 30 October 2019, 20:57

Quote:

Originally Posted by Max...

Err, hands up who you would rather buy a used engine from?

1). Fenlander.
2). BP.

Hmmm...???

I don't sell I only Buy. And if I ever sell I decide who I sell to

smallribber · 30 October 2019, 20:58

Quote:

Originally Posted by beamishken

I hear what your saying but people reading realy shouldnt be encouraged to take the fix it when its broke approach to maintenance

There is somewhere between what you post above and pulling a perfectly good engine to bits

smallribber · 30 October 2019, 20:59

Quote:

Originally Posted by Ferryman

Some people are engineers not surveyors.......just saying

And your subject is 'The bleeding Obvious'

smallribber · 30 October 2019, 21:04

Quote:

Originally Posted by beamishken

Bilges here we come[emoji26]

Says the bloke who dragged it there

Fenlander · 30 October 2019, 22:23

You realise when the delivery arrives next week I will punish you all with the assembly images complete with excessive price OE Yamaha gaskets and torque wrench to hand.

smallribber · 31 October 2019, 07:47

Quote:

Originally Posted by Fenlander

You realise when the delivery arrives next week I will punish you all with the assembly images complete with excessive price OE Yamaha gaskets and torque wrench to hand.

Will be a pleasure to watch and follow on Ribnet……. It is good that someone is keeping Ribnet alive as it is somewhat slow thesedays

Windsurfer · 02 November 2019, 21:06

Great thread Fenlander , looking forward to tackling some of the basic maintenance on my 15hp 2stroke.

Fenlander · 11 November 2019, 14:51

Continues from post #55!

The gaskets etc took about ten days to arrive from BottomLine Marine IOM. I used them as they had all I needed shown in detail on their website so I could ensure they were the correct items. I chose all Yamaha gaskets to give the best chance of a spot on job.

https://www.bottomlinemarine.com/

First the head. I blasted each thread hole out with carb cleaner then dried with a cotton bud as it's very easy to get gasket debris or oil down the end of the thread causing part of the bolt's torque to be due to bottoming out. The Yamaha spec was to lubricate the cleaned bolts with 2-stroke oil on threads only... and not to add any compound to the head gasket... so I followed that.

The head is a 2-stage torque. The lower two bolts are impossible to access with a torque wrench so at each stage I tightened the prior accessible bolt in sequence and got a feel of that with a spanner and then replicated that feel on the lower bolts.

Yamaha very helpfully cast the tightening sequence numbers into the head... a useful neat touch.

Fenlander · 11 November 2019, 14:53

Next on with the cleaned exhaust cover plates. Again very tight access for the bottom three bolts.

Nice to see this plate and the head back on without any major hassles.

Fenlander · 11 November 2019, 15:07

Carb clean and overhaul next. There wasn't a sign of debris, corrosion or gum anywhere in the carb so a quick blast through with cleaner was sufficient.

I mentioned in post #55 the (non adjustable) float height was at the limit of its range... the new float and pin brought that spot on so the fuel height will be absolutely correct now (was a bit high).

The carb kit comes with a new idle mixture screw/needle and I was surprised to see the old one quite distorted at the taper... perhaps from screwing in too hard to get the base position.

Folks have differing opinions re using the old gaskets but I rarely will. 16yrs of compression had flattened the gaskets more than I'd want to see refitted. The rubber float bowl gasket had lost 35% of its thickness for example and the top plate gasket was heavily imprinted.

As I mentioned further above the fuel pump diaphragm was distorted... then when I took the new one from its packet I realised how fuel hardened the old one was in comparison... not far off splitting I reckon.

Anyway all went together OK.