Sourcing a Damper Plate

[kable]

There is so much great info on this board but the prices in the posts from 10+ years ago kill me compared to today.  I guess this inflation is real.
This is going to be the first of many transmission related posts...

I am going to be replacing my transmission so I need to purchase a new damper plate for my M-25XP
I really haven't found any good deals out there, anyone have some info?

Looking at Catalina Direct, I was surprised to see the aftermarket part more expensive than the OEM.  What would be the difference?
OEM - $430 https://www.catalinadirect.com/shop-by-boat/catalina-25/engine/damper-plate-oem-5411-m-12-m2-12-m-18-m-320-m-25-m-25xp/
After Market - $560 https://www.catalinadirect.com/shop-by-boat/catalina-25/engine/damper-plate-aftermarket-5411-m-12-m2-12-m-18-m-320-m-25-m-25xp/

[KWKloeber]

Is your plate 121mm or 122mm?  A few C30 folks with M-25/XPs had an issue getting the correct size.

[Jim Fitch]

Kable -

I have the M35 engine.  When I pulled the transmission, I could clearly read the Sachs part number on the plate 1866-052-001.  I replaced it in 2018 and I think I paid less than $130 for it.  They seem to be going for $150 now.  I don't want to know what Westerbeke charges for the same part.  It might be a different plate on the M25 and maybe someone can tell you the part number so you don't have to pull the transmission 1st.

Jim

[KWKloeber]

I asked an owner who replaced his and the Sachs worked perfectly on his XP.
Suggest you confirm the current/new diameter before you purchase.

[KWKloeber]

maybe someone can tell you the part number so you don't have to pull the transmission 1st.

The 35 reportedly takes a 6" plate.

The Sachs plate our C30 owner used was 1866-050-02 BUT there was a difficulty getting a 121mm plate (eventually sourced from CD) because the others were 122mm and did not fit.

[Jim Fitch]

Can anyone identify the correct Sachs part number for Kable's Universal M25XP?

[kable]

@KWKloeber - I haven't pulled the transmission yet so I can't answer your question.
My brother-in-law is going to be helping me w/ everything and he is hours away.  I was hoping to order everything and just have everything ready.

I would have assumed the 2 items from CatalinaDirect would have worked but I had just heard they were more expensive and there are other options that people have used.  Are you suggesting I should measure, even if I order from CD?

@Jim - thanks, so it sounds like I am looking for Sachs for my M25XP.  If someone has a part number that would be great!  But at least I have some more keywords for googling around.

[kable]

It looks like the likely Sachs part number is 1866-050-002/3306316001 (as KWKloeber stated and from this post)
https://www.cruisersforum.com/forums/f54/replacing-damper-plate-on-a-universal-m25-at-anchor-222965.html
But it still seems to be about the same price as CatalinaDirect $450.

Also, still a concern on the size.
The CD part says 121mm
The Sachs part says 122mm

So the cost being the same, I guess I should just go w/ CD.

I wonder what the difference is between CD's OEM and aftermarket?

What about PYI?  I have seen this quote but no links/data to help me.
"PYI has a superior damper plate for Universal then the stock one"

I see this from ASAP Supplies in the UK.  Specs are SO close and much cheaper (VAT/shipping etc)
So is .5mm going to matter?
https://www.asap-supplies.com/products/spring-drive-plate-for-zf-hurth-10-teeth-spline-121-5mm-diameter-df254750

Just don't understand why I am seeing success posts w/ Sachs and the same engine...

[KWKloeber]

The C30 friend who ordered the CD plate says it WAS a Sachs 050-002 and it WAS 121mm and that the 122 that he bought DID not fit.  My distributor (who used to be a Univ/Wb stocking distributor and who also services H/ZFs) says that the 050-002 plate IS 122 mm and also IS THE replacement for the H/ZFs on the M-25s / XPs. 

This is like a bad Twilight Zone episode.

I asked the C30 friend for more info, we'll see....

[kable]

Anyone know where I can find the torque specs for the damper plate bolts?

Edit:
Ended up using the parts manual to determine what exact bolt was being used on the damper plates.  Then based on that I could read the quality? number on the bolt.  With both of those pieces of information I was able to look it up in standard google searches.

[britinusa]

I know this topic is nearly 4 years old but still relevant.

I have my new damper plate and it fits. However Took a bit of Googling, but I think I found the correct torque for the Hex Cap Screws that secure the damper plate to the flywheel.

The screws are    "298458   M5 x 12 Cap screw Din 912"

I found one resource indicating that the torque should be 10Nm.

I'll have to get a torque wrench for that. I have a digital torque driver up to 6Nm and a larger one but not 10Nm.

Just wondered if anyone could confirm the 10Nm Torque setting.

Paul

[MarcZ]

Damper plate part# 298454 for M-35A - price on-line  $1,155.30 ......
Can someone wake me up or at least suggest an alternative.

[Jon W]

Paul, what PN damper plate did you install? Did you find the torque values? What are they? What is your review of the new damper plate? Thanks for the help.

[Kyle Ewing]

The part number for the damper plate that came out of my 1990 M25xp was Hurth/ZF 1866050002.

I replaced with the same part number when I put in a ZF10M in 2012. Price then was $140.  The tranny was $1052.

If I remember correctly, you'll need new crush washers. Not a big deal of you have a parts store near where you're doing the work.

[KWKloeber]

Damper plate part# 298454 for M-35A - price on-line  $1,155.30 ......
Can someone wake me up or at least suggest an alternative.

@MarkZ

I can likely get one for a 35A from my stocking distributor who supplies me my other parts.  If you want, email me your info, location.

<<~ (Use the email link on the left panel) or WeekendRProducts@aol.com

-Ken