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Old 09-13-2021, 08:59 PM
steveb@baylake.net's Avatar
steveb@baylake.net steveb@baylake.net is offline
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Does the ZF 63A Transmission have any kind of clutch ?

My old 1986 ProStar and 2004 ProStar both have the 1:1.5 transmission that sounds like parts are flying around inside when navigating around the dock. I believe it was in 2004 they changed the oil recommendation to 15W-40 Motor oil to reduce the rattle.

It doesn't rattle when you first start it up when the lubricant is cooler. I was thinking about using some STP Transmission Oil Additive to increase the viscosity a little. But its not for any gearbox with a clutch.
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Old 09-13-2021, 09:42 PM
mikeg205 mikeg205 is offline
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There are clutch plates the engage when pressure in the transe increase. The rattling could be your dampening plate

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Old 09-15-2021, 08:25 AM
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Quote:
Originally Posted by mikeg205 View Post
There are clutch plates the engage when pressure in the transe increase. The rattling could be your dampening plate
Thanks . . I think I a going to switch to an upgraded damper place that is known to eliminate the rattling at to provide smooth quiet shifting.
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Old 09-15-2021, 09:37 AM
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FourFourty FourFourty is offline
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For what it is worth, my friend had a high-ish hour 2005 prostar (1300 hours) that made a ton of clattering noise when maneuvering at slow speed, especially in reverse. He ran it for years like that, always thinking it was a worn transmission that was clattering at low speed.......

Then one day, he dinged his prop.....

When we took the old one off, we noticed the splines were worn a little bit. Didn't think much of it until we ran the boat with a new prop on it. The low speed noises were completely gone. Like, completely eliminated the low speed trans noises. It is perfectly quiet, and butter smooth now. Turns out it was slop in the prop splines all along.
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Old 09-16-2021, 07:43 AM
88 PS190 88 PS190 is offline
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Quote:
Originally Posted by steveb@baylake.net View Post
Thanks . . I think I a going to switch to an upgraded damper place that is known to eliminate the rattling at to provide smooth quiet shifting.

Should atleast help. The earlier trans were straight through and the engines sat at the same angle as the propshaft. That ZF has more gears and angles the shaft down so the engine sits level.

But those gears then all have lash.

Prop vs trans and damper can be diagnosed by if it makes noise in neutral or just in gear.
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Old 09-17-2021, 03:11 PM
GWaterski GWaterski is offline
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Changing transmission fluid for 1st time in my '18 ProStar 6.2 w/ZF 63A. Noticed MC Dealer changed from ATF to Rotella 15w-40. The reason, they told me, was to reduce the gear noise at low speeds. This is discussed elsewhere in TT....
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Old 09-18-2021, 10:40 PM
mikeg205 mikeg205 is offline
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Quote:
Originally Posted by FourFourty View Post
For what it is worth, my friend had a high-ish hour 2005 prostar (1300 hours) that made a ton of clattering noise when maneuvering at slow speed, especially in reverse. He ran it for years like that, always thinking it was a worn transmission that was clattering at low speed.......

Then one day, he dinged his prop.....

When we took the old one off, we noticed the splines were worn a little bit. Didn't think much of it until we ran the boat with a new prop on it. The low speed noises were completely gone. Like, completely eliminated the low speed trans noises. It is perfectly quiet, and butter smooth now. Turns out it was slop in the prop splines all along.
Also remember the dampening plate is for smoothing power to trans as cylinders go thru power stroke... the dampening plate is the back side of the harmonic balancer... both need to be working in harmony... pun intended

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Old 09-18-2021, 11:57 PM
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1redTA 1redTA is offline
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harmonic balancer is on the front of the engine and dampner is on the trans side of the engine
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Old 09-19-2021, 03:07 AM
mikeg205 mikeg205 is offline
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Quote:
Originally Posted by 1redTA View Post
harmonic balancer is on the front of the engine and dampner is on the trans side of the engine
Poorly written, thanks for correction

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Old 09-20-2021, 09:40 AM
88 PS190 88 PS190 is offline
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Quote:
Originally Posted by GWaterski View Post
Changing transmission fluid for 1st time in my '18 ProStar 6.2 w/ZF 63A. Noticed MC Dealer changed from ATF to Rotella 15w-40. The reason, they told me, was to reduce the gear noise at low speeds. This is discussed elsewhere in TT....
This does help but very minorly. ATF which is what the factory specs is something like a 5 or 10-20 wt oil depending on which ATF. But the funny thing about it is its really not controlled to the viscosity in the way motor oil is so different brands work differently, but a 15w40 is certainly thicker than ATF.
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