a whirring sound

In article <fbb68b8b-4c90-43a9-9972-98b253bd3dfa.DeleteThis@s13g2000prd.googlegroups.com>,
Blazer Fan Dan <BlazerFanDan.DeleteThis@gmail.com> wrote:
>I have an 85 245, and I'm hearing a whirring type sound, that seems to
>be coming from the back. It's like the noise you hear when you're
>downshifting, but it's not based on the clutch or gear-shift.

>It seems to be worse when it's cold, and seems to be more based on the
>speed of the vehicle, and not the rpms' of the motor. If I put in the
>clutch, it doesn't make much (if any) difference.

>I hope it's the power steering pump (which I'm replacing this
>weekend). I'm thinking it might be the clutch cable, but i havent'
>checked that yet. How do I check the fluid level for the tranny (if
>you do?)?

From the back would be the differential or main fuel pump. If you can
hear it when standing still, it's the fuel pump; only when moving,
the differential is probably low on fluid.

If you get a bottle of lube that has a pointed nozzle, you can push a
short piece of vinyl tubing onto it to make it easier to add; there's
more clearance across the car than in front of the diff. Holding the
bottle horizontal with the tubing stuck in the fill hole works well.

The power steering pump is in the front, and wouldn't make noise in
the back of the car.


Gary

--
Gary Heston gheston.DeleteThis@hiwaay.net http://www.thebreastcancersite.com/

We live in amazing times, when one person can invent both the Internet
and global warming, then get awarded a "peace prize".
 >> Stay informed about: a whirring sound 

In article <36eeedb5-833d-4f86-a1dc-0b9cfee6b11b.RemoveThis@e10g2000prf.googlegroups.com>,
Blazer Fan Dan <BlazerFanDan.RemoveThis@gmail.com> wrote:
[ ... ]
>thanks. I know this is a bit of a stupid question, but what lube do I
>get?

IPD sells RedLine 75W-90 gear lube for differentials. I don't remember
offhand what I put in my 145, it's been a couple of years... Any name-
brand synthetic 75W-90 should work fine; someone with a owners' manual
may have a more precise answer for that.

> And where does it go? I'm going to change the oil (and PS pump)
>this weekend, so I might as well do other stuff.

The differential has two plugs on it, on the front of the housing. One
near the bottom is used for draining old fluid, which is probably
impractical in cold weather. The fill hole is above the drain. Both are
square, not hex, and will probably be a bit of a challenge to get out.
Apply penatrating oil, let it soak in while you're changing the oil,
and then try to get it loose. You may have to tap on the end of the
wrench with a hammer to encourage it a bit.

Once you get it out, fill to the bottom of the hole and reinstall the
plug. Sometime around August, you may want to drain and refill to get
most of the old lube out.


Gary

--
Gary Heston gheston.RemoveThis@hiwaay.net http://www.thebreastcancersite.com/

We live in amazing times, when one person can invent both the Internet
and global warming, then get awarded a "peace prize".
 >> Stay informed about: a whirring sound 

May be the centre driveshaft hanger bearing. The comment about the
noise appearing when colder is a dead giveaway here. Try injecting some
lubricant under the rubber dust seal between the inner and outer races
of the bearing. If the noise stops, you have found the source. You may
be able to extend the life of the bearing by many year-s this way.
Certainly easier than removing the driveshaft and replacing the bearing.

Blazer Fan Dan wrote:
> I have an 85 245, and I'm hearing a whirring type sound, that seems to
> be coming from the back. It's like the noise you hear when you're
> downshifting, but it's not based on the clutch or gear-shift.
>
> It seems to be worse when it's cold, and seems to be more based on the
> speed of the vehicle, and not the rpms' of the motor. If I put in the
> clutch, it doesn't make much (if any) difference.
>
> I hope it's the power steering pump (which I'm replacing this
> weekend). I'm thinking it might be the clutch cable, but i havent'
> checked that yet. How do I check the fluid level for the tranny (if
> you do?)?
 >> Stay informed about: a whirring sound 

On Feb 4, 12:18 am, Ross G <r... DeleteThis @b2b2c.ca> wrote:
> May be the centre driveshaft hanger bearing. The comment about the
> noise appearing when colder is a dead giveaway here. Try injecting some
> lubricant under the rubber dust seal between the inner and outer races
> of the bearing. If the noise stops, you have found the source. You may
> be able to extend the life of the bearing by many year-s this way.
> Certainly easier than removing the driveshaft and replacing the bearing.

Thanks, I'll try that too. Even though the noise seems to have stopped
after I checked the rear diff.
 >> Stay informed about: a whirring sound