Molecular--Bob Posted February 23, 2018 Share Posted February 23, 2018 Hi all About to bolt up my diff / prop but don't have spring washers in the parts bag, should the prop to diff bolts have spring washers under their heads? Ian B Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted February 23, 2018 Member Share Posted February 23, 2018 On my 1998 de Dion, from the Assembly Guide:PROPSHAFT TO DIFFERENTIAL FITMENT14 Attach the propshaft to the differential output flange using the four special blue bolts (polythene bag "miscellaneous"). No washers are required. Tighten to 42 lbft (58 Nm). Jonathan Link to comment Share on other sites More sharing options...
elie boone Posted February 23, 2018 Share Posted February 23, 2018 You need a spring washer , or use Loctite as in the "special blue bolts " but i prefer a spring washer Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted February 23, 2018 Member Share Posted February 23, 2018 Is there a difference between versions, please, elie?Jonathan Link to comment Share on other sites More sharing options...
rj Posted February 23, 2018 Share Posted February 23, 2018 The blue bolts come with Loctite in the thread and are safer than a bolt with a washer. Link to comment Share on other sites More sharing options...
Bricol Posted February 23, 2018 Share Posted February 23, 2018 Yes, the blue coating is simply blue threadlock - low hold stuff.Spring washers spread under load, especially cheap ones, so I don't tend to use them. If you really want a shakeprrof washer, use a Nordlock washer - but don't blame me when you can't get them undone when you need to - they really do hold on tight! Link to comment Share on other sites More sharing options...
Wrightpayne Posted February 24, 2018 Share Posted February 24, 2018 No washers on mine - I have used loctite on re-assembly on the (several) occasions its been apart.Ian Link to comment Share on other sites More sharing options...
elie boone Posted February 24, 2018 Share Posted February 24, 2018 if one is using inferior parts you can't expect it performs as a quality item. Tread lock has 2 potential problems, 1 is that often the wrong tread lock is used, other too strong or not strong enough and second if you undo a bolt with tread lock you need to clean the bolt and the flange of old tread lock and this is something often not done properly. and last with tread lock a bolt will be resisted until the very last tread comes out, not so with a washer. Link to comment Share on other sites More sharing options...
rj Posted February 24, 2018 Share Posted February 24, 2018 with tread lock a bolt will be resisted until the very last tread comes out, not so with a washer. That's just what I want for a propshaft. Should the bolts come loose there'd be a lot of vibration to catch my attention before it's to late.Sitting next to a unsecured propshaft is unhealthy. ISTR somehting about one that gave up the ghost; even the seats were destroyed. Fortunately the driver was not, but I think that was more a question of luck. Link to comment Share on other sites More sharing options...
elie boone Posted February 24, 2018 Share Posted February 24, 2018 I've build a few cars and never ever had a prop shaft bolt come undone. Link to comment Share on other sites More sharing options...
rj Posted February 24, 2018 Share Posted February 24, 2018 Nor have I. Still it's something I dread. Link to comment Share on other sites More sharing options...
Bricol Posted February 24, 2018 Share Posted February 24, 2018 :Like wise - but I have had a prop break - yoke broke apart and rattled around in the tunnel a little bit ;-) Link to comment Share on other sites More sharing options...
7 wonders of the world Posted February 25, 2018 Share Posted February 25, 2018 Best place for spring washers is the bin, the spread with load, or fracture and fall out leaving the fastener loose.Prop flange mating surfaces should be checked, bolts should be prepped with blue loctite clean and be dry under head then torqued correctly. Link to comment Share on other sites More sharing options...
DJ. Posted February 25, 2018 Share Posted February 25, 2018 I always add a spot of paint so I can check they haven't moved too. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted February 26, 2018 Member Share Posted February 26, 2018 Best place for spring washers is the bin, the spread with load, or fracture and fall out leaving the fastener loose.The famous NASA paper...Jonathan Link to comment Share on other sites More sharing options...
7 wonders of the world Posted February 26, 2018 Share Posted February 26, 2018 Extract from the above paper.....Wk washers The typical helical spring washer shown in figure 14 is made of slightly trapezoidal wire formed into a helix of one coil so that the free height is approximately twice the thickness of the washer cross section. They are usually made of hardened carbon steel, but they are also available in aluminum, silicon, brome, phosphor-bronze, stainless steel, and K-Monel. The lockwasher serves as a spring while the bolt is being tightened. However, the washer is normally flat by the time the bolt is fully torqued. At this time it is equivalent to a solid flat washer, and its locking ability is nonexistent. In summary, a Iockwasher of this type is useless for locking. Link to comment Share on other sites More sharing options...
Bricol Posted February 27, 2018 Share Posted February 27, 2018 Yep - good for finger tight and a bit, not much cop for anything requiring torquing up correctly.Any washer (other than the nordlock I mentioned earlier) acts as a nice bearing surface to allow things to undo. I only specify them if I need to spread the load. Link to comment Share on other sites More sharing options...
elie boone Posted February 27, 2018 Share Posted February 27, 2018 For sure you only want to read what suits u. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted February 27, 2018 Share Posted February 27, 2018 Actually no Elie I speak from experience and with good engineering practice, and having seen countless loose suspension components over the years where spring washers have fractured and fallen out. Link to comment Share on other sites More sharing options...
Paul McKenzie Posted February 27, 2018 Share Posted February 27, 2018 That comes from using cr*p Link to comment Share on other sites More sharing options...
7 wonders of the world Posted February 27, 2018 Share Posted February 27, 2018 I wasnt and don't use them..... merely discovering there failings on vehicles...... Link to comment Share on other sites More sharing options...
Bricol Posted February 28, 2018 Share Posted February 28, 2018 25 yrs in engineering design, involved in automotive, aerospace, military and currently sat on my bum in Houston after another good days work, I stopped specifing and using them 22yrs ago.If I need an anti-vibration washer in general engineering, nordlock get my vote. But on a propshaft - blue loctite. Even if Heinkel are still to get back to me about the results of a second graduate interview 27 yrs ago . . . ;-) Link to comment Share on other sites More sharing options...
elie boone Posted February 28, 2018 Share Posted February 28, 2018 i've seen nuts with quit a bit of damage due to the spring washer when undone but my preference is Schnorr washers. but he i am only a bush mechanic. Link to comment Share on other sites More sharing options...
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