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tranny clunk

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xtwister
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xtwister

tranny clunk

Post by xtwister » Fri Mar 22, 2019 7:14 pm

I was sorta pushed into getting a 2001 v70 t5 for free.
All I knew was that it had a tranny clunk with low miles.
I took it as a second car and found out what I was in for. (financially) lol
It barely passed safety so its legal.
So the car has 170k km which is low for the year. I think it sat for awhile. Leather seats really dirty.
Car smells musty. But everything works besides the tranny clunk. No check engine lights.
I did replace the b4 servo cover and did a drain refill which reduced the clunk.

I guess my question is that your supposed to reset the tranny adaptives. I dont have the vida module yet.. Its been
ordered. Will the tranny adapt as I drive it for now periodically? Or should I park it till I get the vida so reset the adaptives?

Tranny: When I picked it up.. Slammed extremely hard between 2nd and 3rd: Outside temp was extremely cold.
servo and tranny fluid change. It reduced it by alot but still there. After driving 1/2 hour it shifts smoothly. Outside temp not as cold



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SuperHerman
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Re: tranny clunk

Post by SuperHerman » Fri Mar 22, 2019 11:57 pm

Not sure what a tranny clunk is - but in the end of your post you mention hard shifting between 2 and 3. Are these the same?

For tranny clunk I would focus on your transmission/motor mounts.

For hard shifting, I would focus on your valve body solenoids. You may get lucky and some clean fluid will remedy the situation. I assume when you did your drain and fill you did not see any metal shavings or glitter showing a hard part failure. The standard fine crud on the magnet is fine. Assuming you did not - read on.

Your year is one of the first and most problematic for the V70 transmission - they made some changes to the valve body solenoids that lessened the internal particle build up which reduced their tendency to stick and gum up. It sounds like you have some sticky solenoids. If you want to try the fluid flush method to see if it clears up I guess it cannot hurt things.

Right now I would throw in 1/2 a bottle of SeaFoam Trans Tune and run it 400-1000 miles, assuming you can deal with the "clunk". Then do another drain and fill and put in the rest of the bottle. Run it until it smooths out or until you cannot live with the slamming. Maybe the solvent and fresh fluid will work. You are not going to see immediate results - the crud buildup is serious if the fluid was never changed. The added solvent will help. It is no magic bullet, but if you want to try why not.

Basically your valve solenoids have build up crud which causes them to stick. Once they have enough pressure on them they work, but you get the slam. If you do a search you will find videos on the valve body solenoids being repaired with the TransGo kit. You will see the man use a special drill bit (provided in kit) to clean out the crud which appears like black carbon. Once this is cleaned out of the bore the solenoid valve can move freely.

If you want to repair it correctly you can do a TransGo rebuild kit mentioned which allows you to service the valve body and solenoids. I have done this route a couple of times. Other route is to buy some Rostra Solenoids and swap them only. Many have gone this route with success. When I did my valve body repairs I did not see any excessive wear so I think a solenoid swap would have been just as effective and less work.

As for the adaptations, the transmission will slowly learn the new fluid is there, it just takes longer and can add wear. If you can live with it then driving it "smartly" (avoid slamming) it won't hurt that much. Doing an adaptation most likely will not make a difference - you need miles to get the fluid to do some cleaning. An adaptation reset can not adjust for sticking solenoids. Those are my thoughts based on having the issue and reading a bunch on it. Lots of guy and gals on here with plenty of expertise on the issue - they may have more information and/or thoughts.
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Rvolvos



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Re: tranny clunk

Post by EngineeringBloke » Sat Mar 23, 2019 8:05 am

For the musty smell in your car

Before my S60, I was given a Saturn by my mother-in-law. The car had been smoked in and being in it for more than a couple of minutes gave me a headache. My wife had it detailed at a local repair shop but the odor was barely diminished.

I did some research and found the following product. I applied it and it worked. There are instructions online (below) but basically spray the headliner, seats and carpet with the cleaner, then spray into the air intake outside at the base of the windshield with the A/C on, and leave the car closed up and running for about 5 minutes, then continue with windows open for 5 minutes. I think I did also spray all the hard interior surfaces too, but this was a long time ago. I did this process twice and the smell was gone.

This stuff is very good. It is biodegradable, non-toxic and effective. Worked on the kid's running shoes, too.

How to use:
https://www.nokout.com/Remove-smells-fr ... k-Out.html




xtwister
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Re: tranny clunk

Post by xtwister » Sat Mar 23, 2019 6:07 pm

Thanks guys for the replies

SuperHerman: No there was no metal or anything that I could see when i did the drain refill. It looked like the fluid was changed not too long ago. If first started to come out brown and then turn reddish. Also it looked abit overfilled. I put the proper amount back in. Did the b4 servo cap change and flaring and slamming was reduced by alot. But still there.

When i did the safety the mechanic commented that he thought the tranny had been replaced at some point. He was pointing at a part number plate that was on the transmission near the dipstick area.

I took it on a 300km road trip today. After the tranny warmed up, it drove and shifted smoothly. Like you said that the pressure builds up and the solenoid(s) are no longer sticking. At this point I can step on it and feel the t5 power.

I'll try the seafoam trick to see if that helps.

EngineeringBloke: I'll look into that product. I'll first give it a cleaning. Steam clean the carpets. Try to clean the leather seats. Never seen back seats that looked so dirty. Maybe they had a dog or somehting. I've had volvo's before and leather always looked brand new (besides driver seat wear) The interior looks like it hasnt been cleaned in years.
I know what you mean with the musty smell giving you a headache. I had to put the window down a couple of times to refresh the air.



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Re: tranny clunk

Post by Rvolvos » Sun Apr 07, 2019 9:26 pm

SuperHerman wrote:
Fri Mar 22, 2019 11:57 pm
Not sure what a tranny clunk is - but in the end of your post you mention hard shifting between 2 and 3. Are these the same?

For tranny clunk I would focus on your transmission/motor mounts.

For hard shifting, I would focus on your valve body solenoids. You may get lucky and some clean fluid will remedy the situation. I assume when you did your drain and fill you did not see any metal shavings or glitter showing a hard part failure. The standard fine crud on the magnet is fine. Assuming you did not - read on.

Your year is one of the first and most problematic for the V70 transmission - they made some changes to the valve body solenoids that lessened the internal particle build up which reduced their tendency to stick and gum up. It sounds like you have some sticky solenoids. If you want to try the fluid flush method to see if it clears up I guess it cannot hurt things.

Right now I would throw in 1/2 a bottle of SeaFoam Trans Tune and run it 400-1000 miles, assuming you can deal with the "clunk". Then do another drain and fill and put in the rest of the bottle. Run it until it smooths out or until you cannot live with the slamming. Maybe the solvent and fresh fluid will work. You are not going to see immediate results - the crud buildup is serious if the fluid was never changed. The added solvent will help. It is no magic bullet, but if you want to try why not.

Basically your valve solenoids have build up crud which causes them to stick. Once they have enough pressure on them they work, but you get the slam. If you do a search you will find videos on the valve body solenoids being repaired with the TransGo kit. You will see the man use a special drill bit (provided in kit) to clean out the crud which appears like black carbon. Once this is cleaned out of the bore the solenoid valve can move freely.

If you want to repair it correctly you can do a TransGo rebuild kit mentioned which allows you to service the valve body and solenoids. I have done this route a couple of times. Other route is to buy some Rostra Solenoids and swap them only. Many have gone this route with success. When I did my valve body repairs I did not see any excessive wear so I think a solenoid swap would have been just as effective and less work.

As for the adaptations, the transmission will slowly learn the new fluid is there, it just takes longer and can add wear. If you can live with it then driving it "smartly" (avoid slamming) it won't hurt that much. Doing an adaptation most likely will not make a difference - you need miles to get the fluid to do some cleaning. An adaptation reset can not adjust for sticking solenoids. Those are my thoughts based on having the issue and reading a bunch on it. Lots of guy and gals on here with plenty of expertise on the issue - they may have more information and/or thoughts.
This worked for me. Within 100 miles of driving no more cluncks during 3 to 2 downshifts. Ended up putting the whole bottle after draining out to much (500ml). This made the difference, had already drain and filled 3 times the transmission and did reset adaption, no improvement. 2005 V70 2.4 NA 140kmiles, never had the transmission fluid replaced. Thanks!
Solenoids are on the shelf for now.


2006 XC70 2.5T183k
2006 V70 2.5T 142k (son)
2005 V70 2.4NA 140k (son)
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Re: tranny clunk

Post by SuperHerman » Mon Apr 08, 2019 6:56 pm

Rvolvos glad the SeaFoam TransTune worked for you

For others - it is worth a try, but the earlier solenoids were updated so they flow freer (at least that is what I have read) so cleaning with a solvent would have better results. Just something to think about, but as I said, for $8 a bottle it is clearly worth a try.



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