Volvo outdrive rumble turning only
 

Ok so i have seen a lot of threads and have lived with the SX-M drive vibrating fairly hard on turn's left of right only...trimming is another world only at very high (high articulation) does the drive shrudder. So the drive is off and the knuckle's are as free and easy turning as one could hope for...that is not loaded.... so i cam across the below post and asked myself the question...could it be..i would just hate to throw away a good pair of joint's so i am asking for some input i really hate that damm vibration in the turn... so what shall it be... Toss out the old and in with the new????


http://www.*****************/boat-for...-wheel-cranked


The thing with our drive shaft bearing crosses (aka U-joints) is that when under power (for the majority of the time), we are pretty much nagivating straight forward.
This places the drive shaft geometry in a fairly straight alignment.
Unlike the automotive counterpart, there is minimal articulation.

What this means, is that the bearing "cap" and bearing cross "trunion" are contacting more so in the same location....... rather than a rolling needle bearing pattern where there is more articulation.
What we get is a wear groove that actually accelerates the wearing out of our bearing crosses.

They may still feel rather smooth, but may not be in good working order.
This is very likely the source of your vibration.
For the cost of replacement, it becomes the thing to do.

I did not read all of your thread .Sorry about that.

Volvo Penta only recommends buying the complete assembly and not to change out just U-joints. Volvo claims they are all matched and come as a complete balance assembly plus do not want to compromise new U joins in old possible worn assemblies. Have no idea if this will help or not about your app and are you 100 % sure your U joints never been changed ?

I am not saying u can not change out just the U joints alone as I have as well many of times. If you order thru Volvo they do not have just U joints to sell for their input driveshafts to their dealers.

With that said I have heard thru some and some complaints that boat owners have reported vibrations even after brand new U joints only (not assemblies) were installed. Just saying.

https://www.marinepartsexpress.com/b...P-44-1-5_1.pdf

here is one of the SB about some of it and possible help to maybe your cause

Bup i do not know how to thankyou enough i have the 3855714 drive incredible.

http://i99.photobucket.com/albums/l2...g?t=1435266612

http://i99.photobucket.com/albums/l2...2006/penta.png

Your welcome, what is hard about posting OEM information is I can not post it - so I remember the Service bulletins & numbers off the top of head and then have to search for them if all possible thru google in which you can only find some. Then post that link up here.

If you can find Volvo Penta service bulletin 44-2-20 If I recall that has info about U - joints to that might helpful. .

All my reference and service manuals are in storage so thank whomever my memory is still somewhat good but I am getting old so that will only last for so long.

Again look for Volvo SB 44-2-20 if I recall correctly.

Here is one thing on it:
http://www.marinemechanic.com/volvo/sb-44-2-20.htm

Thanks SB that is it, but I think the real Volvo SB had a bit more info about it. but that is the jist of it in the link you posted. I knew that SB had some info about U-joints.

We mark all positons for the U-joints , yokes and related parts before disassembly then upon reassembly we put it all back in the exact position even if new parts being installed - they all go back in the same exact positions so we hopefully eliminate any unbalances.

IMO I think that is were some of the complaints come from after new U-joints alone were installed. But it is very wise to inspect all yokes and other related parts for wear, cracks and any out of rounds.

waterproof lipstick works great for marking all parts Just saying.

BUP i again thank you for your input...I owe you more than a few beer's.

Whatever came about this ? Also can you tell me what year you have here along with your engine model number.

Also can I get more pics of your U joints Thanks.

In your post number 1 you have a link listed in blue - what is that link to ? Can you direct me to it and or any other links about this. I have a reason and I will tell you later. THANKS.

http://www.marineengine.com/boat-for...wheel-cranked&

Well i took a quick look at the SB and misinturpted the meaning, i have chased this rumble for so long i just jumped to the conclusion that the drive shaft was not secured correctly when in fact it's a update for the new part and the correct bolt. The knuckles were still in pristine condition and replacing them would have only made things worse since the original's were balanced to the CV. I just bolted her back up and live with the low end rumble i've had a few guy's other than myself look at this thing and they cannot see or find any fault in the setup....Now have you found something???? The only thing i we could ever come up with is the drive not only pivot's left to right <-------]-------> but also angle's a bit on the turn \-----]-----/ and simply believe that sets up some kind of harmonic...who know's.

I have a V- 8 Volvo SX drive pwr with steering. Its a 2000 year model in now that I just started working on.

It will vibrate and make noise ONLY in gear at full lock left and full lock right of the steering wheel and ONLY in the water and ONLY in GEAR - WILL NOT do it on the water hose nor in throttle only nor in throttle only in the water either at any rpm's or trim level. Nothing very smooth

When it vibrates and is making noise in gear at idle and steering wheel full locked turn even on the trailer you can pull back into N everything becomes very smooth - put it in throttle only at any rpm even 3500 rpm - trimmed half way with steering wheel locked full left or right nothing - smooth as silk - shift in fwd or rev at idle full left or full right of the steering well - you have vibration and noise once again.

For testing so far I Put a brand new Aluminum prop on and speced the propshaft for straightness all perfectly good there.

. Next info - straight ahead and 9 & 3 oclock on the steering wheel nothing even at full throttle 5000 rpms trim half way up Nothing - no vibration no noise - no nothing. .

Everything is pristine including the alignment is so spot on that I can use any 2 fingers and slide the tool in and out.. It has only 200 hours total run time.

I am changing the U- joints next regardless. It is not the gimbal bearing. Know that 100 %

could be Pinion bearing outer and or inner but think its the u joints and possible the yokes either out of round or unbalanced. the balance is so important with these Volvo's. I am back on it tomorrow with new U-joints.

Well i can tell you i have a 2001 SX-M one oddity that does exist is the gimbal bearing sit's in some kind of other bearing that allows the gimbal to rotate on a 360 axis this inner bearing does bind at high and low obtuse angles that is if you take the alignment tool and and swivle it around no binding occurs but take the alignment bar and force it to a high say 60 degree angle hard left... stop and slowly move it.... i do get some bind and on all four corner's and only when slammed or pushed is a better word. The vibration starts however when the drive is centered... on and while under way and small turn's.....The drive way is never a problem prop on prop off...only underway slow speed and the vibration is never proportional to speed

The ujoints and gimbal as butter smooth. And PS steering included.