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Old 21 August 2015, 16:37   #31
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God grief... My sympathy to all of you! This is outrageous on such new and little used engines!

It's ridiculous using such a flimsy part as that. Just mere penny pinching.

All credit to the engineering company producing these replacement pulleys. At least a solution is at hand.

I'm glad I own a Yamaha outboard though!
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Old 21 August 2015, 19:52   #32
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Yamaha isn't perfect either buddy. Blocks corroding, flywheels needing replaced every 30 hours etc.

Unfortunately all makers have things like this with design flaws in their range. At least in this instance the motor survived.

With the lower weight and emission restrictions these days you have to wonder how long Outboards will last. My local boating area has lots of engines well over 25 years old. It remains to be seen if modern engines will make it that long before becoming economically unrepairable with all the fancy electrical systems these days.

Cheers
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Old 21 November 2015, 19:41   #33
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Honda 20HP Cam Pulley Failure

Hmm, pulley from aluminum isn't good idea.
Aluminum isn't good for steel, when it gets warm, the size of pulley will increase and it will play on steel shaft.

I wouldn't buy it, I would go with steel
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Old 22 November 2015, 05:35   #34
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Appears to be a much better idea than the plastic one
As it's a few years since these became available I wonder if anyone who has fitted them has any feedback & whether the point you make is an issue.
Aluminium timing gears are nothing new as a quick Google will show - seem to be popular with the performance brigade - & if they were that problematic I'd expect lots of stuff on how bad they are.
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Old 22 November 2015, 09:27   #35
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I understand, but I follow on my experience in RC Hobby Cars. All aluminum parts which contact with steel parts brake pretty quick, plastic with steel more reliable. Does any one has blueprints of this pulley, so I could make 3D model of it? I want order pulley here in Ukraine, from steel.
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Old 22 November 2015, 15:21   #36
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Quote:
Originally Posted by ukrsonic View Post
plastic with steel more reliable.
I'm not being funny, but you have actually read this whole thread & seen that the problem gears are the ones which are a combination of steel & plastic?
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Old 22 November 2015, 23:42   #37
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"plastic with steel works" - I meant as spare parts, not a single combined part (like Honda makes). For example: plastic gear with steel gear works just fine if you ajust correct gap between them.

But for the pulley I would go with steel part anyway

BTW - the reason that Honda makes plastic pulley - the noise, on metal pulley it should be a little more noisy, but you can add some vibroplast to the cover.
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Old 23 November 2015, 04:36   #38
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Wasn't unusual for geared camshaft drives - as in gear on crank drives gear on camshaft through meshed teeth - before the mass usage of cam belts.
As you say, an issue with steel on steel gears is noise so some engines - e.g Ford Essex & Cologne V6 - has a steel crank gear and a cam gear with fibre or nylon teeth. Whilst quieter they could fail, not a problem with an engine where the valves & pistons are far enough apart not to collide but could be catastrophic other wise. Not a lot different to what happens when a cam belt fails - or in the case of these outboards the gear falls apart! (There are aftermarket full steel gears available for the above Ford engine).
For an engine where the cam is driven by a belt there will be no noise issue as there is no meshing of gears.
Other than the weight I can't see a problem with you having one made in steel if that was your preference.
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Old 03 April 2016, 18:56   #39
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Hi all, I have a Honda bf20d with a bad timing pulley. I'm trying to figure out the flywheel position for TDC on #1 cyl. The manual refers to lining the shaft keyway up with the cyl bore, but since I don't have to remove the flywheel I cannot see the keyway. Are the keyway and the timing mark in line? If anyone knows, it will save me a bunch of labor. Any info will be greatly appreciated.
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Old 21 April 2016, 01:21   #40
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I have a 2004 honda 20hp and I usually put a 150 hours on it a year and have not had a failure with the cam pully and I have not replace the timing belt yet. maybe I should get it checked
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