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March 6th, 2008, 02:21 PM   #31
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ah yes the spacer was a bit of a rush job, strictly functional lol .
i actually shot/bead blasted the casing where the bearings sit , this makes the surface grow a bit ,loctited the bearings in place , i think it will hold this time


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scrap
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March 6th, 2008, 03:01 PM   #32
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Originally Posted by scrapveiw
ah yes the spacer was a bit of a rush job, strictly functional lol .
i actually shot/bead blasted the casing where the bearings sit , this makes the surface grow a bit ,loctited the bearings in place , i think it will hold this time


regards

scrap
Which loctite did you use?

Joe
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March 6th, 2008, 03:05 PM   #33
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green bearing lock 642 rings a bell, same as what we use for automotive manual gearboxes, i can give you the exact product number tomorrow.

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scrap
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March 8th, 2008, 09:38 AM   #34
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joe it looks like you already know your loctites

would you agree on 642 for the job

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scrap
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March 8th, 2008, 11:35 AM   #35
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Originally Posted by scrapveiw
joe it looks like you already know your loctites

would you agree on 642 for the job

regards

scrap
Scrap,

No I would use 620, which has a much higher strength and maintains that over the temperatures we are talking about in the engine cases.

Consider curing it at temperature so it will still be in compression at engine operating temperture (100 C). None of these do well in tension, mainly good in shear and compression.

I just looked at both of the specs more closely, and I would say they are closer than I remembered in strength, but I would still use the 620 if I was doing it. I would also use the 7649 Activatorfor the strongest result.

Joe
Attached Files
File Type: pdf 642-EN.PDF (17.2 KB, 72 views)
File Type: pdf 620-EN.PDF (60.0 KB, 25 views)
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March 8th, 2008, 05:24 PM   #36
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thanks for the info joe, the loctite i use will hold, but if you have found a better one then perhaps i will order some in and give it a go

the 642 is the strongest we use and it has'nt let me down yet and in the absence of any stronger stuff in stock .

its's actually designed for bearing carriers in gearboxes , gearboxes don't tend to get that hot and the loctite goes off ok.

i think the stuff i use is rated at 3500 , steel to alloy bond as associated in gearboxes,

and it is rated at 300 degrees , you would have to boil your engine oil to destroy the loctite.

i think 642 and 620 have their own individual Merritt's and as the data shows ,
their ain't much between them .

But you have bought up a good point ,

to some people loctite is loctite and they don't realise that their is more than one type

best regards

scrap
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