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Timing belt question

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xtwister
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xtwister

Timing belt question

Post by xtwister » Fri May 31, 2019 3:46 pm

I changed the timing belt last weekend on a new to me v70t5
i aligned the crank mark to the marking on the block. I couldnt see the notches on the
teeth as in the tutorials. The cams aligned to the proper notches on the cover.

First start it stumbled abit for the first second or 2 and smoothed out. Battery was disconnected during belt change.
2nd day of driving I got the ECM-261a. While i reset the code it did that stumble again for a second or two again.
I also checked the connection to the Maf.

Code came back during the next drive (abit faster this time) It also seems like during midrange it doesnt quite have the
pickup for a 250hp engine (unless I really step on it and it drops a gear) But I'm not sure because I dont really get too many chances to step on it because of traffic and didnt do it before because the old belt was way past due since I didnt know the history of car.

Question is.. if the belt is off a tooth, what would be the symptoms? Is it the VVT doing the timing and figuring itself out?
Is the 261a code totally unrelated? Also on todays drive the CE light turned off on its own. (I had the AC on this time)



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tardcart

Re: Timing belt question

Post by tardcart » Fri May 31, 2019 4:26 pm

for a quick timing double check turn the damper till the large scribe on its face points straight at the front timing belt and then check the cam marks. you just have to take the main cover off and turn the wheels to see the damper and get a socket on it to turn cw. dont even have to jack it up or remove the tire. one tooth off on the crank is a lot and I doubt it would run. Usually the exhaust cam goes on one tooth retarded since its hard to snug up the belt across the cams.



xtwister
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xtwister

Re: Timing belt question

Post by xtwister » Fri May 31, 2019 5:20 pm

Thanks for the reply tardcart. When i did it last weekend I checked the cams with 5 rotations.. yes overkill but they were aligned.
I was concerned about the crank. I did align it to the notch on the crank pully... I didnt see anything that was inscribed. I did pull the crank pulley off because i couldnt put the new belt on like I could on an s70.

You mentioned if the crank was off a tooth then most likely it wont run, which in my case it runs smoothly.
I'll still check when the engine is cold. I was going to check earlier but everything was still hot.

So the 261a is unrelated to the belt change? Although the CE is gone for now?



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Re: Timing belt question

Post by oragex » Fri May 31, 2019 6:00 pm

Anything else done along with the belt ? Water pump, coolant, thermostat ? Tensioner needle in the middle with the engine cold 70F ?

This is how the two notches on the crank teeth look like. Notice the bump on the block side is closer to the notch on the left - normal https://images.matthewsvolvosite.com/s6 ... -marks.jpg

Also the notches on the cover and rather hard to match with those one the cams, because we can't really look perpendicularity to them - I used a pen to make sure they match, especially the exhaust side

Have to say, I put my belt back two times with the battery removed, and upon firing up it doesn't stumble at all, it starts like any day.



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Re: Timing belt question

Post by MDK » Fri May 31, 2019 6:06 pm

Hey all...so.. this is a cam locking tool from IPDUSA. it's really for the old 850's up to 1998. But why hasn't anyone made one for the P2 5 cyl? Did I miss something? Or I am being unrealistic in a simple approach? Wondering..



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xtwister

Re: Timing belt question

Post by xtwister » Fri May 31, 2019 6:29 pm

Thanks for replying Oragex. I also did the tensioner and pulley. I did the tensioner for cold engine as it wasnt driven in over 24 hours. I did not do the waterpump as the car has 170k km or around 100k+ miles. It does concern me the engine stumble after first start and code clear. Seemed odd to me, thats why i'm asking the questions. I'm also new to the VVT, and if that had some impact on the first start stumble.



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Re: Timing belt question

Post by abscate » Sat Jun 01, 2019 4:15 am

You can’t just align marks on a VVT engine, you have to pretension the cam by passing the mark down m then go backwards to align. Lots of threads on vvt.

If it’s off by up To three notches it will run but code. One notch off is barely noticeable if you drive with a light foot.


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xtwister
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Re: Timing belt question

Post by xtwister » Fri Aug 23, 2019 7:21 pm

Thought I would update on this thread.
The CE light went away and I didnt end up checking the timing belt at that time.
I had a road trip of 3k km in July. Car was fine although good highway passing for a t5 sucked.
For a long trip I got 9.3 l / 100km.. (around 25mpg ) for 100% highway. I've done the same trip with 850 and s70 in the past and
I thought that was horrible. But ac on full for the entire trip since it was 100f outside and ac had its issues. The 850 and s70 got low 7's (30mpg)

After the trip i did pull apart and check the timing. It was off on the intake side by a couple of teeth.
Dont know how since I checked it so many times but whatever.

I redid the timing and.drove around for the next month or so.
Now i have say that the midrange is great, and overall acceleration is great and what a t5 should be.

Wish i did check the timing before the trip so that i could see what the mpg would have been.



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Re: Timing belt question

Post by 93SCMax » Fri Aug 23, 2019 8:08 pm

Just a hint from a 2001 V70 T5 manual transmission owner for the last 18 and 1/2 years...I've never gotten better than 25 mpg on any "highway" trip running 70-75 mph. If you want 30+ mpg, you will need to buy an NA or a different model.

Glad you got your timing straightened out.



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Re: Timing belt question

Post by vtl » Sat Aug 24, 2019 8:19 pm

Even with NA you have to roll on a plastic fuel saving tires with no grip at all and drive like a granny.

My highway MPG is 19...


05 XC70 260k, 16 XC60 40k, 19 Tundra 1k

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