Faulty flex plate

[downwinder]

Greetings. Im learning about my perkins 4-108. It has that clik clak clok sound that that happens when the flex plate is faulty. Can anybody explain what is the correct way to change a flex plate. This is a beneteau first 38. I have acces to the motor from the top and through the sides. Thanks in advance.



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[NahanniV]

Originally Posted by downwinder

Greetings. Im learning about my perkins 4-108. It has that clik clak clok sound that that happens when the flex plate is faulty. Can anybody explain what is the correct way to change a flex plate. This is a beneteau first 38. I have acces to the motor from the top and through the sides. Thanks in advance.



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Not sure what you are talking about ?

A Flex coupling is between the transmission and prop shaft to absorb small angular misalignment between transmission and prop shaft.

A damper plate is between the engine and the transmission to absorb torsional pulses from the diesel engine that would otherwise be damaging to the transmission clutches.

Cheers,
JM.

[downwinder]

Correct. I was refering to the damper plate. Thanks


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[NahanniV]

Don't know your exact engine room layout, but generally:

- disconnect the propshaft from transmission. slide the shaft back if you can, depends on type of shaft seal you have, are you in the water ? clean and check the shaft for burrs before sliding it into a stuffing box. Dripless seal may not allow you to move the shaft back without disasembly. Depending on the length of the shaft and bearing arangement you might be able to lift it up or down so that the transmission can be pulled back. Another option in some cases is to disconnect the engine mounts and slide the engine forward. Or pull the engine.

- disconnect the transmission: cooler, control cable, mounting bolts.

- pull the transmission back out of the damper plate and place out of the way.

- you should now have access to the damper plate. remove it, probably has some broken or worn springs, replace it or have it rebuilt.

Good luck,
JM.