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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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 Posted: Sat Jan 04, 2020 11:31 am |
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Hi. I have to replace the oil seal on the front diff of an 81 1.0 litre sierra.
Apparently this model does not have a crush tube for bearing preload like thd 1.3 litre models do but uses shims for the preload. Does anyone have the procedure for setting the preload of this model. I do have a 1.5 to 10nM digital display torque wrench to check the turning resistance.
Regards Alan
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Brenno
Joined: Thu Apr 22, 2010 11:30 pm Posts: 996 Location: Hobart
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Posted: Sat Jan 04, 2020 11:40 am |
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Buzz it off and buzz it back on tight. The shims set the preload so no need to be that specific about torquing the nut to a certain tension.
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303zuke
az supporter
Joined: Wed Aug 19, 2009 11:30 pm Posts: 2447
Vehicle: LJ50V, SJ70
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Posted: Sat Jan 04, 2020 2:58 pm |
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Correct. Shims make it a straight forward flange on and off procedure if you are only going to replace the seal.
However, if you replace either of the Pinion Bearings, then new shims will be required and you will need to set up the pinion depth with shims (in 2 locations) using a dial gauge. In that case, using a new crush tube as fitted to Type 3/4/5 SJ40 might be simpler.
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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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Posted: Sun Jan 05, 2020 12:25 pm |
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Hi. All back together nearly. Just need to torque the pinion nut.
Does anyone know the torque setting for this nut. 81 model Sierra without a crush tube. I have only been able to get a manual for the later model Sierras which have a crush tube therefore a different setting.
Any idea where an 81 manual can be found.
Thanks in advance.
Alan
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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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Posted: Sun Jan 05, 2020 2:22 pm |
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May have found the torque. In a prevoius post it was mentioned to use the LJ80 settings. 200 nm is about midrange of the required torque.
Regards Alan
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303zuke
az supporter
Joined: Wed Aug 19, 2009 11:30 pm Posts: 2447
Vehicle: LJ50V, SJ70
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Posted: Sun Jan 05, 2020 2:23 pm |
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The torque is not critical. Manual says: "1,700-2,300Kg.Cm (65-108ft.lb)"
Just tighten the nut until the castellated nut aligns with a split pin hole on the pinion.
I don't which manual you are looking at? Haynes or some cr**? All Suzuki SJ40 manuals start with Type 1/2 and add supplements in the back for later models.
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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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Posted: Sun Jan 05, 2020 3:40 pm |
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Hi. Thanks for the info. I am after a real Suzuki workshop manual that has the 81 - 83 model. All i seem to find online is from the 84 model onwards.
Regards Alan
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bumstein
az supporter
Joined: Sat Oct 06, 2012 5:49 pm Posts: 1975
Vehicle: Sierras!! SWB and LWB
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Posted: Sun Jan 05, 2020 5:31 pm |
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200 mid range is about right. SJ410 FSM says 166-225Nm 
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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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Posted: Mon Jan 06, 2020 12:23 pm |
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OK. I stuffed up. Where the oilseal fits was rusted for the first 8mm approx then the diff case was shiny smooth. I assumed the seal fitted in where the shiny metal was. This put the seal against the bearing. ( i did clean up all the corroded metal)
Also on the flange that fits into this seal the shiny surface is only 8mm long.
When i filled the diff with oil it poured out the back under the seal. The oil gallery at the bottom of the diff is exposed by about 1mm which allows the oil to flow under the seal.
I watched a youtube where the seal was installed flush with the end of the diff. If i did that i am sure the rougher metal of the flange would chew it out in no time at all.
I do not have much faith in the video as he torqued the pinion nut up with a rattle gun.
My options are
a new seal seated 2 mm shallower
????
Regards Alan
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Alan
Joined: Thu Oct 10, 2019 8:30 pm Posts: 42
Vehicle: Sierra SJ410
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Posted: Mon Jan 06, 2020 12:57 pm |
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After more research there is a difference between an 81 and an 84+ oil seal. Cant figure out what yet. Megazip lists the replacement as 14.8mm wide and says 2 are needed? 14.8mm might be the overall width with the external lip.
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303zuke
az supporter
Joined: Wed Aug 19, 2009 11:30 pm Posts: 2447
Vehicle: LJ50V, SJ70
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Posted: Mon Jan 06, 2020 8:15 pm |
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Alan"I do not have much faith in the video as he torqued the pinion nut up with a rattle gun.
Regards Alan[/quote]
[quote="303zuke wrote: The torque is not critical.
Just tighten the nut until the castellated nut aligns with a split pin hole on the pinion. Rattle gun is fine on these diffs. Some versions of these diffs have plastic-filled locknuts that don't use a split pin. Same method, just spin them up till they're tight. The torque is not critical.
Last edited by 303zuke on Mon Jan 06, 2020 8:19 pm, edited 1 time in total.
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303zuke
az supporter
Joined: Wed Aug 19, 2009 11:30 pm Posts: 2447
Vehicle: LJ50V, SJ70
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Posted: Mon Jan 06, 2020 8:16 pm |
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Alan wrote: After more research there is a difference between an 81 and an 84+ oil seal. Cant figure out what yet. Megazip lists the replacement as 14.8mm wide and says 2 are needed? Part number is 09283-35008. 2 are required per vehicle, ie one for the front diff and one for the rear.
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