Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 23-01-2013, 13:00   #1
Registered User

Join Date: Mar 2008
Boat: Chris White Atlantic 46lr
Posts: 17
Lewmar Syncro block failures, a potential major hazzard

Just a quick heads up about a lewmar syncro 90 block SWL 2000KG which we were using as part of our running rigging, This block basically pulled the Lewmar schackle through the end SS pin. We only had minimal pressure on this block at the time and it has never been super loaded to the design specs or even 1/3 of it. Clearly there was some manufacturing fault in the stainless steel. After much to and fro about this through the lewmar agent, Lewmar's response was

"the head pin has been worn through by possible vibration of the rigging or some other means"

so beware....They clearly don't care about their clients and if you have Lewmar blocks you may want to inspect them on a regular basis. This is an accident waiting to happen and I am amazed that Lewmar are not interested.

Photos of the failure can be found here.

https://picasaweb.google.com/103419419518034555314/BrokenLewmarBlockPegasusDec2012?authuser=0&authkey =Gv1sRgCIiC4OrOpN3tOw&feat=directlink




__________________

__________________
Pegasus SVYC is offline   Reply With Quote
Old 23-01-2013, 14:51   #2
Registered User
 
funjohnson's Avatar

Join Date: Mar 2010
Location: Currently Indiantown FL
Boat: 37' aluminum pilothouse "Elements"
Posts: 1,847
Re: Lewmar Syncro block failures, a potential major hazzard

Yikes! I have 6 of the syncro blocks for my three sets of reefs (they were cheap). Scary to think what would happen if that failed when I was using the third reef. Guess this is way we should always tie in the reef once we get it down.

I'll be getting Garhauer blocks to replace these soon.
__________________

__________________
MJSailing.com - Written Blog
Youtube MJ sailing - Vlog
funjohnson is offline   Reply With Quote
Old 23-01-2013, 15:08   #3
Senior Cruiser
 
44'cruisingcat's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 7,458
Images: 69
Re: Lewmar Syncro block failures, a potential major hazzard

Made me check mine. They all look perfect. There must have been some flaw in the steel, I've loaded some of mine pretty highly - broken a 12mm double braid headsail sheet a couple of times.

Dissapointing response from Lewmar.
__________________
44'cruisingcat is offline   Reply With Quote
Old 23-01-2013, 22:30   #4
Marine Service Provider

Join Date: May 2012
Location: New Orleans
Boat: We have a problem... A serious addiction issue.
Posts: 3,940
Re: Lewmar Syncro block failures, a potential major hazzard

Pegasus,

It doesn't look like a defect to me. The damage I am seeing looks like pretty standard corrosion on stainless steel exposed to salt water. Unless the parts are less than a year old I don't see anything that lewmar is responsible for. This is just a good example of why stainless steel is being replaced by titanium.
__________________
Greg

- If animals weren't meant to be eaten then they wouldn't be made of food.
Stumble is offline   Reply With Quote
Old 23-01-2013, 23:30   #5
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,467
Re: Lewmar Syncro block failures, a potential major hazzard

Quote:
Originally Posted by Stumble View Post
Pegasus,

It doesn't look like a defect to me. The damage I am seeing looks like pretty standard corrosion on stainless steel exposed to salt water. Unless the parts are less than a year old I don't see anything that lewmar is responsible for. This is just a good example of why stainless steel is being replaced by titanium.
G'Day Pegasus,

I gotta agree with Greg here: that looks like a classic case of crevice corrosion to me. Brown stains, other propagating cracks, no sign of wear.

I do not know what alloy they use (or claim to use) but many mfg's use the more machinable s/s alloys in such applications, and these don't have very good corrosion resistance.

I'm always leery when I see brown stains around such s/s fittings. It always means something bad is going on chemically.

As it happens, I have a similar fiddle block in my backstay tensioner. I'm about to step out into the cockpit and have a look at mine. Thanks for the heads up!

Cheers,

Jim
__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is offline   Reply With Quote
Old 24-01-2013, 00:54   #6
Marine Service Provider

Join Date: May 2012
Location: New Orleans
Boat: We have a problem... A serious addiction issue.
Posts: 3,940
Re: Lewmar Syncro block failures, a potential major hazzard

I could be wrong, but I seem to remember that lewmar uses 304 stainless for strength on the pins. Even at low loads those shoulders and pin holes carry pretty serious compression loads on a psi basis. Sadly this results in a slightly higher rate of corrosion than in 316, but since 316 isn't strong enough to handle the loads at the required size there aren't many options.
__________________

__________________
Greg

- If animals weren't meant to be eaten then they wouldn't be made of food.
Stumble is offline   Reply With Quote
Reply

Tags
lewmar

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:00.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.