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Bob On This
USA
174 Posts |
 Posted - 08/20/2009 : 4:29:18 PM
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Removed the second transmission from the engine, and found the drive plate tore up. One spring missing and it bounced around and beat the hell out of the rest of the plate.
Has anyone replaced the drive plates before? Is there a better one out there, or is the stock unit the way to go?
The stock unit has three "legs" that bolt to the flywheel and have six springs that act as shock absorbers.
I'd sure like to see something with hard rubber rather than steel springs.
Bob
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Rockmeister
USA
307 Posts |
Posted - 08/22/2009 : 09:31:33 AM
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Hi Bob!
Ran into this last year.
Can see in this link 2nd to last post on the page.
http://carvermitch.forumco.com/topic.asp?TOPIC_ID=401&whichpage=1
It is called a Damper Plate.
They don't fail very often, usually simply from age.
If you check around, you can find them cheaper than the normal cost.
Paid about $100 for mine.
Found mine at a Transmission shop, the guy was very helpful!
Never did find a rubber isolated one, but then figured that rubber probably wouldn't last as long anyway.
Might check the input shaft seal into the transmission closely, sometimes debris and/or a loose damper plate will make it leak and now is the time to fix it, if needed.
Hope this helps! 
79 28' Mariner twin inboard V-drive.
Western Lake Erie: Maumee Bay & The Islands |
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Bob On This
USA
174 Posts |
Posted - 08/24/2009 : 3:30:05 PM
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I guess 20 years is not too bad for these things.
I read that too high an engine speed during shifting can ready tear them up.
Only one spring was out, and it was not even recognizable for what it was.
It beat the mounting bolts up some, but I will get new ones anyway.
The trany's are both at the overhaul shop for new clutches and seals, along with both engines.
My mechanic is thinking 4 grand for both engines and both transmissions. ($1200 for engines and $800 for trans).
Not a bad deal, although I have the engines down to a long block!
The engines looked really good inside, and I'm hoping the transmissions do as well.
Bob
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Rockmeister
USA
307 Posts |
Posted - 08/27/2009 : 7:04:17 PM
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That's not a bad cost for re-building of both engines, let alone including the transmissions!
You might possibly look at balancing both engines, I did my port one and it made a MAJOR difference!
The balance cost was about $170 for one engine.
You can't even tell it is running by vibration at all.
Am very happy I did it!
Trust all is well with you!
Rock 
79 28' Mariner twin inboard V-drive.
Western Lake Erie: Maumee Bay & The Islands |
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Bob On This
USA
174 Posts |
 Posted - 08/28/2009 : 2:54:32 PM
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Ouch, well we found two cracked heads, two bad cams, one bent rod, two broken pistons and a partridge in a pear tree.......
Looks more like 5 grand for engines and 1800 for the tranys.
Soooo, about 6800 for all other than the gaskets I need to order.
At this point we think some water got into one engine. Need to check the exhaust manifold very carefully. Same engine may have overheated at some point, so they may or may not be related.
Goes to show what a compression test does NOT tell you.
Oh well, Break Out Another Thousand....
Bob
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Bob On This
USA
174 Posts |
Posted - 08/28/2009 : 3:02:25 PM
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Oh, and Rock,
I did ask about the balance, and that is included, to some point, maybe not to the nano-gram, but
a lot better than stock. New pistons all around, and they are balanced in a set.
I guess you had the rods balanced as well?
Bob
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Rockmeister
USA
307 Posts |
Posted - 08/28/2009 : 9:15:17 PM
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Had my entire reciprocating assembly balanced, crank, pistons, rods, flywheel, everything!
I have a set of heads, cam, rods, etc if you need them.
Might also find a set of GT-40 Heads for your engine if you have to get new heads anyway.
They will produce more power and usually better mileage.
What was bad on the cams?
Severely worn cam lobes?
If so, that's usually from lack of ZDDP (zinc) in the oil.
79 28' Mariner twin inboard V-drive.
Western Lake Erie: Maumee Bay & The Islands |
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Bob On This
USA
174 Posts |
Posted - 08/31/2009 : 10:03:24 AM
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Rock,
Cams are worn out. high hours.
Bob
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Bob On This
USA
174 Posts |
Posted - 08/31/2009 : 10:07:45 AM
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Hey Rock,
Thanks for the offer, but my "engine guy" has every thing ordered and on the way.
Things will be coming to a screeching halt here in the next couple weeks.I will be going into the hospital for a lumbar spine fusion, and will not be able to work on the boat for about 4 to 6 months.
Bob
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Topic |
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Transmission Drive Plates
