Still rattling
04-25-2018 | 06:32 AM
#1
Thread Starter
VIP Member
Joined: Jul 2009
Posts: 783
Likes: 51
From: NJ
Still rattling
Just got the drive back from my mechanic. He took the drive completely apart again checked every gear bearing. It has a new input shaft new universal's new yoke, new drive shaft and cone clutch. He checked the pre load he said everything squeaky clean and for some reason the rattle still there At 800 rpm rattles 1000 rpm no rattle . If i remove the drive and start the boat no rattling
Any ideas
Thanks
Any ideas
Thanks
04-25-2018 | 09:44 AM
#3
Registered
Joined: Aug 2006
Posts: 1,026
Likes: 16
From: Renton, Wa
I can't tell from the vid.
Is it gear rattle?
On cars/trucks;
If you replace a dual mass flywheel with a solid flywheel you'll get gear rattle.
So, could the coupler be hard as a rock from age, or a bit of spline wear and creating the same effect?
Is it gear rattle?
On cars/trucks;
If you replace a dual mass flywheel with a solid flywheel you'll get gear rattle.
So, could the coupler be hard as a rock from age, or a bit of spline wear and creating the same effect?
04-25-2018 | 06:19 PM
#4
Registered
Joined: Mar 2006
Posts: 432
Likes: 0
From: Lake George NY
I watched video but my old deaf ears can’t hear it. Do you have a y pipe on motors, The flappers in y pipes get burned and the metal rod falls down inside pipe and makes a rattle at ldle but usually goes away as rpm increases. The rubber parts usually pass out exhaust hole in transom. Just something else to check
04-26-2018 | 01:54 AM
#5
Charter Member # 55
Joined: Oct 2000
Posts: 20,232
Likes: 2,482
From: Omaha/LOTO
I watched video but my old deaf ears can’t hear it. Do you have a y pipe on motors, The flappers in y pipes get burned and the metal rod falls down inside pipe and makes a rattle at ldle but usually goes away as rpm increases. The rubber parts usually pass out exhaust hole in transom. Just something else to check
I would swap the drives side to side and see if the noise follows.
04-26-2018 | 06:33 AM
#6
Registered
Joined: Mar 2006
Posts: 432
Likes: 0
From: Lake George NY
Yes I would try swap too. The reason I brought this up is I have run into this before. With drive off there was no noise, with drive on and in the full down position rattling noise. Guessing the back pressure on exhaust with drive on and down gets the metal bouncing around in there. I have heard many boats that had noises that sounded like gimbel bearing problem while running on trailer, but when boat was put in water noise would be gone. Did you check coupler and lube it before putting drive on. Worn coupler or dry couple can make noise at idle. I see you have gone through drive, just trying to give you some other things to look at. I see your in NY if you are any where near my me I’d be glad to take a look at it. I’m in LG
04-26-2018 | 07:21 AM
#7
Thread Starter
VIP Member
Joined: Jul 2009
Posts: 783
Likes: 51
From: NJ
Hi, Thanks for all your replies, Watching the video i know its harder trying to listen on a video than seeing and hearing it in person, but besides the cam noise there is a rotating rattling sound not even with the cam..At 1000 rpm it disappears and when the boat is in the water off course nothing is heard. I noticed this noise last summer while rinsing out the engines after use.The other drive starboard does not do it. The y pipes are not being used. They are capped off. All exhaust and water come out thru transom. I think if i was a coupler you would here more of this noise inside the engine compartment.. The coupler and spline on the drive were greased, new bearing and a bunch of new drive parts...This all started last summer when i wanted the universal changed..That led to a complete new input shaft assembly because the mechanic said that one of the u-joint caps were slightly spinning in the center swivel yoke and shaft coupler. which BTY popped out and i almost didn't make it back to the marina. What a noisy racket having the cap on the ujoint pop up hitting the castle nut..WOW.So it was cheaper to purchase it completely then separate parts with labor.. Input shaft bearing checked, new seal, new washer and new lock nut..They checked the pre-load 6 times...used bearings i believe the book said 6-8 in lbs,.. I use Amsoil marine drive oil..It is clear..so when you drain it you can see if something is not right. the other drive is fine..
No unusual vibrations while cruising. Swapping drives...oh what a pain that is....?
No unusual vibrations while cruising. Swapping drives...oh what a pain that is....?
