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Old 12-08-2017, 17:56   #1
Bennetts101
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AYC Diff rebuild

Hi all

My rear ayc diff started to whine a little while back, have done a few hundred miles and its getting worse so I need to get it sorted.
Who would you lovely people recommend to rebuild it if anyone does that sort of thing? Or should I buy a low mileage second hand unit or even a new one?


Thanks
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Old 12-08-2017, 18:13   #2
stu8
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Dont really hear of people rebuilding AYC diffs, tends to be replace with second hand. Later 7/8/9 are said to be stronger then 4/5/6 but all will fit

Maybe worth dropping the oils first, look for swarf to confirm a failing diff.

Quick question though, what car is this for, if its a 7RS its unlikely to be an AYC diff. Rs diffs are rebuilt

Stu
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Old 12-08-2017, 18:52   #3
Bennetts101
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Dont really hear of people rebuilding AYC diffs, tends to be replace with second hand. Later 7/8/9 are said to be stronger then 4/5/6 but all will fit

Maybe worth dropping the oils first, look for swarf to confirm a failing diff.

Quick question though, what car is this for, if its a 7RS its unlikely to be an AYC diff. Rs diffs are rebuilt

Stu
Ah thanks Stu, will hunt for a second hand one.
Oils have been dropped, not much of a show but have had used our workshops chassis ears on the car and its definitely rear diff.
The car is my 7RS but from factory was fitted with a ayc diff, its a very interestingly spec'd evo.
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Old 12-08-2017, 18:59   #4
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Ah thanks Stu, will hunt for a second hand one.
Oils have been dropped, not much of a show but have had used our workshops chassis ears on the car and its definitely rear diff.
The car is my 7RS but from factory was fitted with a ayc diff, its a very interestingly spec'd evo.
ahh ok, just checking

I'd personally hold out for a 8MR or 9 rear diff, newer so hopefully less miles

7/8/9 tend to be a bit more expensive than 4/5/6

Stu
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Old 12-08-2017, 19:08   #5
Bennetts101
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ahh ok, just checking

I'd personally hold out for a 8MR or 9 rear diff, newer so hopefully less miles

7/8/9 tend to be a bit more expensive than 4/5/6

Stu
I will do, am in no real rush as she only goes out a few times a month
Am I right in thinking 8 and 9 are super ayc?
Do I need to change the pump aswell?
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Old 12-08-2017, 19:16   #6
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there are internal differences on the 8MR and maybe 9. Not sure what the difference is though. As for pump, no need to change that. Personally i'd do as I did years ago, and look for a rear diff off a standard E8 260, as thats spent its life handling less power

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Old 12-08-2017, 19:25   #7
Bennetts101
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there are internal differences on the 8MR and maybe 9. Not sure what the difference is though. As for pump, no need to change that. Personally i'd do as I did years ago, and look for a rear diff off a standard E8 260, as thats spent its life handling less power

Stu
Ah ok, thanks very Stu, much appreciated
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Old 12-08-2017, 23:19   #8
Clivew
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Depends on what is failing in the diff. Some of the bearings are replaceable, the CWP isn't available new, so no go if it's failing. The only way to know is to remove the inspection cover from the left hand casing and have a look at the crownwheel.
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Old 12-08-2017, 23:21   #9
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there are internal differences on the 8MR and maybe 9. Not sure what the difference is though. As for pump, no need to change that. Personally i'd do as I did years ago, and look for a rear diff off a standard E8 260, as thats spent its life handling less power

Stu
The difference between E7 AYC and E8/9 SAYC is the torque multiplier which increases the torque transfer capability of the diff.
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Old 13-08-2017, 01:37   #10
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The difference between E7 AYC and E8/9 SAYC is the torque multiplier which increases the torque transfer capability of the diff.
I remembered you telling me something about the difference a while back, but couldnt remember exactly what it was, so took the safe option of just saying there is a difference

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Old 17-08-2017, 23:31   #11
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whesn it whining too? if when you tuen corners its the clutch plate fluid that needs flushing with oil changes
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Old Yesterday, 20:51   #12
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I have a EVO X SAYC diff if that any help?
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