|
|
This is on my 1980 242 w/ M46.
I've never had a serious gearbox problem in a 240 but I believe it has finally happened.
I've noticed a noise for a while. The best description I can give is that it sounds like metal scraping against metal.
It occurs as I accelerate and dies when I push in the clutch pedal. Let out the clutch, the noise comes back.
It is very pronounced in 1st and 2nd gear, maybe a little less in 3rd and not heard at all in 4th.
Just this morning the 1st, 2nd and 3rd gear occurences started to sound ugly. And it also started happening in reverse.
The absence of noise in 4th gear makes me think it is related to the intermediate shaft.
Am I thinking correctly? The car shifts and runs okay so far but I noticed a bit of hesitance in 1st today which was not previously happening.
--
'80 DL 2 door, '89 DL Wagon
|
|
-
|
|
|
Thanks for the responses.
The way it happens in all gears but 4th pretty much nails it down. I can't find anything else that would account for it.
It answers some questions, though. I used to hear this clicking noise at low speed and I think that was the first sign of this problem.
Then came a noise that I attributed to a bad throwout bearing. When I got in there the bearing was fine but, unbelievably, the bearing carrier was completely loose at the pivot end. I thought surely this must have something to do with the noise. After fixing that the noise continued.
Over the last month it got worse and last Saturday it became apparent that I had a real problem.
I'll be putting the original M45 back in it very soon. I'm going to miss that OD though, what with the 3.91:1 rear axle.
--
'80 DL 2 door, '89 DL Wagon
|
|
-
posted by
someone claiming to be jwalker
on
Tue Sep 20 06:50 CST 2016 [ RELATED]
|
|
What do you think it is?
|
|
-
|
|
|
A bad bearing as you suggested. This was also the gist of the TBricks thread pointed out by kittysgreyvolvo.
I didn't suspect this until last Saturday when it got real bad and also started occuring in reverse.
I hoped there would be some not-so-obvious condition because more than once in the past I have posted about something I thought was a problem only to be advised that it might be something less serious, which turned out to be correct.
But now I can't find anything external that could be causing this noise.
--
'80 DL 2 door, '89 DL Wagon
|
|
-
posted by
someone claiming to be jwalker
on
Mon Sep 19 12:45 CST 2016 [ RELATED]
|
|
As mentioned, check for rubbing - exhaust etc.
Hope I'm wrong but it sounds suspiciously like a bad tranny bearing. Had similar symptoms a long time ago on a BMW 2002.
|
|
-
|
|
|
Could it be the need of a clutch adjustment or perhaps a bad throwout bearing? I'd start by adjusting the clutch, since that's the easiest thing to do (;
|
|
-
|
|
+1 on the throw-out bearing. However, if quiet in 4th gear ....
When driving any manual transmission-clutch equipped vehicle, you press the clutch pedal at the time to change gears or go into neutral.
If you have the habit of maintaining a pressed clutch for prolonged periods, like at stop lights, you'll hasten clutch component failure. The throw-out bearing, the pressure plate, and the release arm (can bend).
The noise may be from some other cause inside the bell housing. Though maybe not.
When you park your 240, do you engage a gear while parked? Please do not use the reverse gear.
Else, if not making such a sound while in fourth (OD engaged or not?), have you checked the quality and level of the transmission fluid? Looked at the magnet loads in the drain (and we hope) fill plugs.
Though unlikely, all the mounts are good? All securing hardware torqued properly?
OD engagement or release issues?
All exhaust hangers are good? Exhaust aligned properly and not making unwanted contact with under-body parts?
Any synchro issues in the four forward gears during engagement and disengagement?
Sound varies while accelerating or decelerating (over run) in 1, 2, 3, & R? Anything, any sound, in 4 with or without OD while accelerating or decelerating (over run)?
Though I imagine you do care for it and maintain fluid level and perform recurring clutch cable adjustment.
There maybe some threads that mention this issues with M46 here on your brickboard.
http://forums.turbobricks.com/showthread.php?t=109413
I can't find others or the articles I recall. Google and Bing are giving useless results today. The brickboard search is not so good today either. Can't find the articles.
Hope that helps. Sorry for your M46 problem.
Else, I got nuttin. Sorry.
Sat-Your-Day MacDuff.
--
Give your brickboard.com a big thumbs up! Way up! - Roger Ebert. 
|
|
-
|
|
ok, I just have to ask...
Why would you not want to place the transmission in reverse when parking the car?
Please elaborate as I'd like to know why not and if I do what harm is it causing?
Thanks,
Matt
|
|
-
-
|
|
|
Duffed,
I just starting looking at the breakdown for the M47 and I see the spring in which you are referring to. In fact, I've seen it many times while I was pulling two transmission out of cars at the local PNP. I had to open each one up to make sure that they were intact before I purchased them.
My two M47 cars are normally parked either on a slight incline, decline, or flat surface.
Within the next year I'll be rebuilding one of them as the fifth gear bearing is screaming pretty bad so it's got to come out. While I'm in there I'll investigate this further. At the moment I do not intend to change, but will keep this tucked away in the back of my mind when parking said vehicles.
One would think that if this were an issue that Volvo would have mentioned it. It would also be interesting to know what Volvo recommends when parking a vehicle equipped with an M47 transmission.
Thoughts?
Matt
|
|
-
|
|
|
Hiya Matt,
A sort of pressing question. More for Oldduke. How would one find spare M47s, other than a 240, 700, 900 so equipped? Any special venue besides here and turbobricks and other forums?
What do you think is the source of the M46 noise bulletproof is describing?
It is a stay that can break off that plate, just under the cover, the spring sets against in M47 when you use reverse to park. Not the part the spring moves with, providing resistance, when you put the gear shift lever into reverse.
If you going to rebuild the fifth gear in an M47, I'll guess parts like bearings and gear remain available? Of you use bearings and parts that are generic that fit the application?
We can look at the owner manual about parking method.
http://volvo.custhelp.com/app/manuals/ownersmanualinfo/year/1993/model/240
(A host of publications for 1993 240 model year.)
On page:
http://volvo.custhelp.com/app/manuals/OwnersManual/om_id/1146
We read:
"Always use the parking brake (hand brake) when parked.
In order to obtain the best possible performance of the parking brake, the brake lining should be broken in. (See section titled "Breaking in period".)"
There's other info in the owner manual on use.
Though nothing about using the manual transmission to park in place of or addition to the parking brake.
So, I guess we are doing it wrong, then? Like for 30 years or more, in my case.
...
I was told by a Volvo mechanic, like ages ago, after driving at highway speeds and everything is hot, to not apply the parking brake at all, or at least no harder than needed to stop the 240 from rolling, whether manual in 1st gear or automatic in park. The remaining heat in the rear hub / brake works can cause the rotor to warp and premature parking brake pad and works wear. If you have to apply the parking brake, well, you have to (Yogi Berra parlance?).
Also, when on a hill:
- With the automobile front end pointing down the hill, turn the front wheels to the curb. So in a runaway, the automobile merely rolls into the curb.
- With the automobile back end end pointing down the hill, turn the front wheels away from the curb. So in a runaway, the automobile front end merely rolls into the curb, or, if the automobile tire does not contact the curb and rolls into the street, it rolls back into the curb (we hope?).
I guess you lock the steering, too.
What do you think?
Thank you,
Buttermilk Boy.
--
Give your brickboard.com a big thumbs up! Way up! - Roger Ebert.
|
|
-
|
|
|
Also check the connection of the exhaust at the front of the transmission. I had a 1990 240 that had the bolt rust through making a metal on metal scraping sound in certain gears that made me think the through bearing was going bad.
|
|
|
|
|
