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Old 01-05-2022, 01:20 AM
Echo1975 Echo1975 is offline
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Join Date: Dec 2021
Location: Finland
Vehicle: Volvo 240
Posts: 33
Default Volvo 245 D24 problems with car I just got

I just bought myself a 245 with a NA D24 engine and manual 4 speed with OD, I am having some issues with it and I hope you guys can help me.

My first minor issue is that, whenever you move the shifter even slightly with OD on, it shifts back into 4th. It's very sensitive for some reason and I wonder if that's normal.

The second issue is when the engine gets hot it sometimes makes a quiet high pitch whine that increases when you floor it and then goes away for a couple of minutes when you let off the throttle

The third small issue is that the speed gauge meter jumps around quite a bit.

I have welded almost all the rust holes and done a lot of work on it already and hope I can solve these small problems too.

The car is very fun to drive
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  #2  
Old 01-05-2022, 08:56 AM
RedArrow RedArrow is offline
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Join Date: Jan 2013
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Vehicle: 1986 Volvo 745 TD
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Dear Forumer,
Nice to have a new member here again! 245s are nicecars. Practical and fun. Diesels are very good for towing and camping etc fun. Share some pictures of the rare survivor.

The m46 transmission overdive button issue is very familiar for those with the standard tranny. I would place my bets on some bad wiring in or around the shifter. Do a gentle inspection of the area and try to see if you can figure out where the wires chafed and may be old or worn. Sounds like an easy fix. Stay in touch how it goes.
The button itself can get `tired` but I think it is the two wires that run into the shifter body.. track those wires back towards the relay area and try to see if there is continuity.

It could also be a faulty 4th gear switch on the transmission, or badly worn wiring that leads to that area through the chassis, out and into the tranny...but let`s wait with that. I mentioned it only because my car had all of those issues, relatively often, repeatedly, and intermittently combined (also on more than one vehicle). Start with the most obvious and track the wires first.
When the 5th gear `jumps out`, try this: hold the shifter in 4th position and with the button engaged into 5th gear and while doing this, try pushing the shifter a little bit towards the ground AND towards the right side of the car. This may help the 5th stay on. When issues developed in my wiring, I noticed that larger bumps or road imperfections would turn my 5th off ... that`s how I knew my wiring was old.... when the 5th gear popped out I often would drive the car holding the shifter and pushing to the right to keep it in 5th. See if that works. That would indicate that nothing major is wrong with your overdrive internally.
I would diagnose it in this order:
1. see if holding it to the right keeps it in 5th
2. track wires, maybe remove the button and connecting the wires manually to see if the section withIN the shifter was the reason
3. go deeper if nothing helps and trace all wires that lead towards the tranny
4. approach the 5th gear switch and maybe just maybe install a new one if nothing else helps. (it isnt the button you press! it is maybe called 4th gear switch, actually, and it is located on the tranny)
But again, wires in the area love to get worn and I bet they are worn by now. I am amost sure it will be a wiring issue.
Check to see if the little button works better in keeping the car in 5th when the shifter top is removed and its wires hang outside of the shifter and the button connected tightly.


The higher pitch sound may be related to a slightly loose alternator belt maybe, especially if the weather is wet where you are experiencing this problem. The power steering belt can also do this, both happened to me earlier, and multiple times. Another easy fix. I would start at the power steering belt and tighten it. Quick and easy..then see if it goes away. Tightening the alternator bet is trickier but if you wanna do it safely and properly, just use the search function of the forum. Multiple threads detail the process.
Or, maybe you can describe further what you mean by `engine hot` and also by meaning `high pitch sound`? What kind of a sound it is and is it always related to RPM, etc. or is it similar to when a turbo whistles or when an exhaust pressure leaks away somewhere? We will have a much better idea about how to help, if you describe even better what *exactly* you hear!

About the speed gauge,
Hopefully it is not a faulty aging connection somewhere in the cluster. The speedo info comes from the alternator, I think, if i recall correctly about the diesels.... maybe check (or clean) the connection there as well.

Last edited by RedArrow; 01-05-2022 at 09:35 AM.
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  #3  
Old 01-05-2022, 01:35 PM
Echo1975 Echo1975 is offline
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Join Date: Dec 2021
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Vehicle: Volvo 240
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Thank you for your reply, I can definitely post some pictures in the near future!

The 5th gear stays on by itself and only goes off if I move the shifter left or right even by a little bit. I am thinking that it's supposed to only turn off when you take it out of gear.

I inspected the wiring on the shifter and gearbox this week and it was cracking pretty bad so I am going to replace it but it doesn't turn on when I move the shifter, only off which is weird if it was the wiring?

I am leaning towards the sensor thingy in the gearbox that checks when you take it out of gear.

The high pitch sound comes ONLY when the engine has reached full operating temperature or is close to it. If I can't get the sound fixed, I will record it and post it here.

The alternator belt is tight, the power steering pump belt should be tighter but the whine is not really one that a slipping belt would make.

I am suspecting that it could be an intake manifold leak. The weird part about it is that the whine goes away when you let off the throttle and only comes back after some minutes.

I think an exhaust manifold leak won't whine on a naturally aspirated engine so it shouldn't be that? I will get a new gasket when I order a bunch of parts at once.

I will try tightening the power steering belt.

I'm sorry for being unclear with speed gauge. I mean the vehicle speedometer. I lubed the wire and almost all of the jumping of the gauge went away. I should probably get a new cable for it.
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