WILDTHING TAZ, u-bolt torque discrepencys
#1
Ginger or Mary Ann?
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You mention many times to check the torque of the 2 upper nuts of the U-bolt for the upper swivel pin for 50 ft lbs as a yearly preventative maintance item, but not going over 53 as it will almost guarantee a stripped or broken part. Tonight while double checking that number thru my Merc bravo service manual, it specs that to be 30-40 ft. lbs. Can you shed some light on the different numbers? When I checked mine, they were right at 40.
thanks
thanks
#2
B-MAX REPAIR
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Service Manual #28 SERIAL NUMBER OM1000000 AND ABOVE. Page 4b-42 States Quote" Torque Locknut's Evenly To 53 Lb-ft ( 72nm ). This Book Is May Of 2000. I Don't Know What Book You Are Using But If It Is Newer Please Let Me Know. THE UP DATE BOOK AFTER THIS ONE HAS NO CHANGES ON THE U-BOLT SPECS.
Last edited by WILDTHING TAZ; 03-18-2005 at 01:35 PM.
#3
Ginger or Mary Ann?
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THANKS! make me feel much better. Wasn't trying to come off as questioning your experience, just why the difference.
My book is the Service Manual #11, 1989 era. My boat is a '99, drive SN's are OL's. What is recommendation? Thanks
My book is the Service Manual #11, 1989 era. My boat is a '99, drive SN's are OL's. What is recommendation? Thanks
#6
B-MAX REPAIR
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i don't think your boat will be a problem. not heavy enough & not enough hp to stretch out u-bolt. thats why you haven't had any problems. most every repair that i am involved in are heavier 37 ft & up boats, with 500hp & larger. if i where you i would't fix something that isn't broke. should you ever take it apart for anything you might increase you torque to 45 and it will work for your application perfect. RON BENDER
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#7
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Ive also seen alot of gimbal ring and swivel shaft problems with smaller boats who's owners like to beach them and let the drive slam on the sandy bottom.
#8
Ginger or Mary Ann?
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Ron,
It wasn't something I was fixing, just doing the preseason R&R drive removals for alignment check and greasing and thought I would check the torque on the u-bolts. All is good then. Thanks
It wasn't something I was fixing, just doing the preseason R&R drive removals for alignment check and greasing and thought I would check the torque on the u-bolts. All is good then. Thanks
#9
CBPBA's Walmart Greeter
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I have 1990 Bravo's, and been torquing them to 50lbs annualy for 15 years but had new HP Gimbals installed 2 years ago. Went to check the u-bolts today and found one of the nuts stripped. The Gimbal Ring & shaft appear to be okay so I may have caught the problem in time.
I'm assuming I can lift the drive up, and pop the u-bolt out for easy replacement but unsure. Did a search for u-bolt, nobody seems to address the removal or installation of it.
Anyone done this before?
I'm assuming I can lift the drive up, and pop the u-bolt out for easy replacement but unsure. Did a search for u-bolt, nobody seems to address the removal or installation of it.
Anyone done this before?
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CHESAPEAKE BAY POWER BOAT ASSOCIATION
'http://www.cbpba.com'
"Experience is something you don't have until just after you need it."