codifus wrote:
> On Feb 25, 7:33 pm, David Geesaman <dgeesamanNOS...@[EMAIL PROTECTED]
>
> wrote:
>> Tom Yakulis wrote:
>>> Hi all,
>>> I drive a '99 Se 5speed that just hit 120K miles. I was wondering what
parts
>>> typically fail and should be replaced around this mileage.
>>> Thanks
>> First, do the 60k maintenance again:
>> - drain/replace coolant
>> - new belts
>> - new OEM platinum plugs
>> - new fuel filter
>> - replace gear oil (use Amsoil MTG or Redline MT-90 - both are
synthetic
>> GL-4 75w-90 oils)
>>
>> Definitely get your transmission inspected. The 4th gen 5 speeds are
>> notorious for having problems with differential carrier bearing wear.
A
>> tranny shop can find it pretty quickly (they just grab the driver side
>> axle end and see if the diff moves within the tranny housing).
Nissan's
>> original transmission assembly did not ****m most of these trannys
>> properly, and depending on how badly the bearings were set is how long
>> the transmission will last. If your bearings are wearing too fast you
>> want to catch it early, take it to a manual transmission specialist,
and
>> have them re-****m the diff during the rebuild. If you procrastinate
the
>> gears/shafts will run misaligned and develop uneven wear and you'll
>> stand much greater risk of sudden failure. I say all this about the 5
>> speed trannys because I've rebuild over a dozen of them and there are
>> more every day.
>>
>> There are other things like oil seals and valve cover gaskets that can
>> develop minor oil leaks. Just keep an eye out for that - many maximas
>> go a much longer time than 120k without these leaks and since the leaks
>> are generally harmless there is no need IMHO to get preventive about
it.
>>
>> Dave
>
> I've experienced this 1st hand in my 98 5-speed. The tranny didn't
> fail, just got incredibly noisy. When I replaced the clutch at 140K
> miles, I also replaced the differential bearings and all was good.
>
> Was the issue fixed in the 2000 thru 2001 5-speed manual trannies? I
> remember the Nissan brochure boasting stronger gears in the manual
> tranny compared to the 99s and below.
>
>
> CD
I only know of one difference between the 95-99 gears and the 00-01 5
speed gears: slightly modified oil grooving. Perhaps they improved the
material a little bit, I dunno. The shafts are definitely the same. I
haven't rebuilt enough of the 00-01's to determine if they were built
properly, but the couple I've done were correct.
One well-regarded internet source found that when he redid his diff
bearings that he needed a different set of bearing ****ms. Assuming his
housings hadn't warped, his postulation that the factory set endplay
wrong is a valid one.
But I think it goes beyond that. My experience rebuilding 95-99 5
speeds has resulted in a large pile of diff bearing ****ms in just 3
sizes. I've never found any other ****m size in a stock tranny, although
when I rebuild them the ****m sizes I use end up all over the tolerance
range. (There are over a dozen ****m sizes). My hypothesis, which will
never be known for sure, is that the original tranny builders did not
have the full range of ****m sizes onhand to accurately set the diff
bearing endplay. So if you were lucky your tranny required the ****m
sizes that were on hand. If you were unlucky your tranny needed a much
different ****m size and it left the factory with incorrect endplay
setting, doomed to die a premature death. Some trannys died within the
factory warranty, but most lasted just long enough to die out of
warranty and within the car's typical life.
Most rebuilders will just re-use the ****ms and not remeasure. They
aren't aware of this endplay setting problem, because most trannys are
built right in the first place. Most customers don't want to wait the
extra days to get the correct ****m size from Nissan, and it will easily
outlast the 6 month or 12 month rebuilders warranty. I always measure
until I'm confident I have the endplay within .001", and use the exact
recommended ****m size. To avoid delays I keep almost every ****m size on
hand. (this is only viable because I rebuild 95-01 trannys almost
exclusively)
Dave
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