Early 1.9 to 2.1 conversion - stop me if I'm being stupid!

[itchyfeet]

Are new domed?
if so I assume convex because old are concave, maybe we had this conversation already.
You know where you could ask?

[CJH]

Haha - we did, and I do.

New were flat, to suit a parallel-sided cam. If I buy used, they'll be slightly dished I expect, so I'd want to return them to flat. But the fact that it was previously suggested to grind a dome into the face of new flat tappets means that re-profiling should be possible, contrary to what my machine shop said. But I wonder if there are limits - how deep is the hardening I wonder.

[itchyfeet]

reharden it after?

[itchyfeet]

some comments here..
http://forum.club8090.co.uk/viewtopic.p ... 5#p8202828" onclick="window.open(this.href);return false;

cam follers present another dilemna,the kbs followers seem flawed somehow giving varying drain down times ,my personal pref would be to use solid and put up with adjustment maintenance,refacing old followers is virtually pointless,we tried on both a long one and the shortest,and the hardening was so thin on the long one we broke thru very easily no hardenening whatsoever on the shortest,.i wont bore with tech stuff on metallurgy but the initial manufacture of the wbx/boxer was robust ,but not rolls royce quality in materials which would allow electro hardening to be applied.,A factor is the alarming differences in worn followers height ,i have noted on 4 engines ive stripped this year differences of +/-3.5 mm per follower across an engine ,that says the hardening has gone ,same with cams ,a brand new cam i obtained had the two centre lobes .30 mm taller ....than outer lobes.......more metal to counter the poorer oil supply ,an effort to extend the cams and therefore the engines life i guess.on measuring old cams all had less height on centre pair of lobes ,backing up my findings on the new one. that wear equates to swarf in the sump,/filter

[CJH]

Hmm - saw that. Doesn't bode well for refacing an old set in that case.

I've been in touch with Rheinmetall, the parent company of Kolbenschmidt, and was put in touch with someone at Elring, who are the UK importers for Kolbenschmidt. The person at Elring seems genuinely interested in getting to the bottom of this, and has asked for photos of the labels on the box that my tappets came in, with a view to tracing the batch number. However, the person who replied from Rheinmetall wasn't aware of any problems, and didn't respond to my question about the Moresa product (Moresa now being owned by KS). So I'm not entirely hopeful of getting a resolution, but the chap from Elring does at least seem genuinely interested.

One issue is that these tappets are used in many different applications, so you'd think that a generic fault would have shown up by now.
But the chap at Elring did acknowledge that sometimes a problem surfaces in only one application. I mentioned that I'm not the only person reporting this problem with their use in WBX engines. I guess the only way they'll find out is if people report problems, so I feel I've done my bit!

[itchyfeet]

So probably the Elring ones JK are selling are KS and thier picture of the oem design is wrong.

[CJH]

So probably the Elring ones JK are selling are KS and thier picture of the oem design is wrong.

Yes, I'd guess so, unless one of the other brands that Elring supply also make a follower. AMC is the only other brand that specifically mentions them on that brands page.

[CJH]

Has anyone got any experience of Motive Components? Their tappets are certainly competitively priced at CarParts4Less. I've emailed Motive for info.

[itchyfeet]

I assume you have telescopic tubes, why not just swap the noisy lifters or do you think they all all bad?

[CJH]

I do have telescopic tubes - I was thinking ahead. I haven't been able to identify whether it's just one noisy one - haven't tried. Maybe I should invest in a stethoscope. I'm assuming it's whichever tappet(s) is(/are) under load when the engine stops. They were all new, and meticulously stripped, cleaned and reassembled, so I have no reason to suspect that only one is faulty. Usually a problem tappet is caused by wear or a build up of varnish.

[itchyfeet]

if you pop rocker covers off and turn engine over so each cylinder is at TDC you can feel an empty lifter because the pushrod can be pushed in, if its solid then its good.
cant tell by listening in my opinion.
rocker cork gaskets are cheap enough and you can reuse if freash anyway.
I swapped one recently on the DG and its better but still some noise so I will go around again to check.

it might just be one or two duffers.

[itchyfeet]

good push with a screwdriver handle when on tdc can feel any movement.

20170806_144801 by Paul_Barr, on Flickr

20170806_145740 by Paul_Barr, on Flickr

[CJH]

Thanks - I might give that a go. I might need to do it a few times to see if it correlates with the tappet(s) being held under load overnight.

[itchyfeet]

I would not expect any less than an extensive study

[CJH]

If a job's worth doing......