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MZ ETZ251 Grimeca caliper seal missing

PostPosted: Wed Apr 19, 2017 5:23 pm
by alexxx
HI folks,

My MZ ETZ251 had a slight weep from the joint at the top of the caliper so I stripped it down expecting to find a small seal between the caliper faces where the fluid transfers accross but...no seal.
The photo shows both sides of the caliper, there is very little space for any kind of seal at the fluid transfer port, should there be a seal here?

Regards

Re: MZ ETZ251 Grimeca caliper seal missing?

PostPosted: Thu Apr 20, 2017 1:58 am
by DerekR
I don't personally know the Grimeca caliper Alexx, but judging from the caliper rebuild kits available for Grimeca (generic example http://www.pmtuning.co.uk/tr6441005 ), and the twin pot calipers fitted to my car - they all contain an 'O' ring to fit in the transfer port. Usually there is a rebate for the ring to fit in, but I seriously doubt there should be nothing there.

Re: MZ ETZ251 Grimeca caliper seal missing?

PostPosted: Thu Apr 20, 2017 4:02 am
by alexxx
Thanks Derek,

There was nothing there when split (why it was weeping I guess)
I also think there should be a seal there possibly a small square section seal but there is very little recess for any seal.
Will contact parts suppliers
Regards

Re: MZ ETZ251 Grimeca caliper seal missing?

PostPosted: Thu Apr 27, 2017 7:45 pm
by alexxx
For anyone else with this Grimeca type caliper, I found and ordered a sealing O-ring for it.
The size is 10mm od 2mm height and width so you should be able to source one of these easy enough.
I have assembled but not yet tested the caliper but will post on here once ready.
The O ring I got was flat on one side, I expect it should be either flat or round both sides as both halves have the exact same 0.5mm recess.

Re: MZ ETZ251 Grimeca caliper seal missing

PostPosted: Sun Apr 30, 2017 5:42 am
by DerekR
Never seen an 'O' ring flat on one side. Must be a 'D' ring!?!? I take it the flat is on an upper or lower face. Anyways, if the recesses are both the same shape, then it won't make any difference which way round it goes in. Be good to hear if it stops the weep.