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Makotosun

75 DT175 crank shims?

  • RT325
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75 DT175 crank shims? was created by RT325

Without looking at the diagram i agree with all you're saying & have pondered the same question myself. The only way it would sit tight is if you fitted the left bearing on the crank & hard against the shim then bolted the crank to the right side then heated & dropped the left case on. Then i guess you have to hope the left bearing stays there & doesn't try to move out if not super tight in the case--& equally tight on the shaft. Maybe the shim is listed to give the outer bearing ring plenty of clearance to the crank wheels although i think the wheels are recessed plus there's a slight step against the crank. So i'm no help am i lol.
21 May 2023 13:50 #1

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Replied by Ht1kid on topic 75 DT175 crank shims?

On my Ct1c I left the flywheel shim out by mistake and when I put the cases back together the flywheel rubbed against the case I thought what the heck is going on then I noticed the shim on my workbench had to take it back apart to install the shim and fixed the problem 
21 May 2023 15:32 #2

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Replied by RT325 on topic 75 DT175 crank shims?

You're talking the right side shim?.
I wonder if that might hold true if the left one was left out & for some [not normal] reason the crank & its two bearings wondered to the left--would left rub on the case. All the same it can't be good to have a free wheeling shim. Wonder if you fitted a shim tight on the shaft so it stayed put incase its needed.
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21 May 2023 15:51 #3

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Replied by MarkT on topic 75 DT175 crank shims?

Yamaha shimmed that year on both sides.  Manuals have a crank width spec tolerance. You start with that width. Then you measure the width between the bearings and select shims to center the crank. 

I've been lucky to always have the stock shims which I just reinstall...  Forgetting to install one on either side can result in crank rubbing. 

Yes, the crank nut clamps the right side.  Left side is a fairly tight press fit into the bearing.  Crank stub needs to be pulled into the inner race of the bearing when assembling case halves.  Without the shim, the bearing can shift over and outer race will rub on crank wheel. 

Later models 175's (78 on) had no shims...  they machined the crank flywheels with a little "bump" that the inner race of the bearing contacts that serve as shims.

My advice is just use the shims



 
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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25 May 2023 12:16 #4

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Replied by RT325 on topic 75 DT175 crank shims?

Thanks Mark, re shim, i did wonder if the crank wheel is recessed on one model or the other. Not going to pull mine apart just to find out [bottom end never been apart since new i 1970 lol]--stand back she could blow!!.
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25 May 2023 14:49 #5

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Replied by nutman on topic 75 DT175 crank shims?

A very sensible reply Mark.
I've raised the same sort of question as well before :
yamaha-enduros.com/index.php/forums/74-7...e-replacement#143388
And your answer suits well I think.

I like to add that I've seen comments online that tightening the nut on the gear-side will also keep the crank from moving/sliding but I disagree with that. Therefor those type engines need both shims to centre.
11 Jun 2023 03:13 #6

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Replied by RT325 on topic 75 DT175 crank shims?

I shouldn't stir the pot again now its settled, but thinking about it & if i come across the same problem i think i'll push the left bearing hard against the shim then fit the crank in the right side [hand push fit on the right] then tighten the crank gear nut. Then heat the left case & hope it all goes on over the bearing in one lucky push & over the slide fit gear shafts etc of course. That'll keep it all snug with no loose shim floating.
Then i've forgotten to apply case sealer & have to start again--hope not lol.
11 Jun 2023 04:23 #7

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Replied by Ht1kid on topic 75 DT175 crank shims?

MarkT is correct on post 6 my Ct1c rubbed I had left it out by mistake thankfully I found out
11 Jun 2023 08:11 #8

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Replied by RT325 on topic 75 DT175 crank shims?

What i said in #9 i know the left bearing wouldn't be 'quite' right home in the case but would keep it snug on the shim & if bearing is tight in the case & will never move & [in theory] everything should be good--for ever--untill next dismantle.
11 Jun 2023 16:48 #9

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Replied by MarkT on topic 75 DT175 crank shims?

Or simply to center the crank and keep bearings/case from rubbing on crank wheels.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
12 Jun 2023 08:42 #10

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