Hi From Portugal and my “new” NX 250

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scrambler
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how to check the NX 250 cam chain tensioner

Beitrag von scrambler » Do Jul 20, 2017 10:11 am

Petrus hat geschrieben:
Di Jul 18, 2017 3:49 pm
One more question, that may be caused by my defective “english knowledge” when watching the manual:
After remove valve cover and remove the cam chain tensioner to test if it works ok (lifter operation) at the end I don’t have to left the rod locks in the retracted position, right? So, how many turns on anticlockwise will I do? The same that I did before on clockwise direction? :?
sorry, I overlooked that last question ;) . For making good I assembled a little how to check the NX250 cam chain tensioner :)

First, check the tensioner tip - there is often breakage due to some previous owner. Then try to push the rod backwarts. You may turn the rod backwarts a bit and try pushing backwarts again - to be on the safe side you may repeat that until the rod is fully retracted.

But this is of course only a static test, if the cam chain is worn out its vibrations will turn the rod mechanism backwarts, the cam chain loosened and starts to rattle - in this case mass out's fix is the solution (unless you change the cam chain)
checking_the_tensioner.jpg
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Petrus
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Registriert: Mo Dez 05, 2016 12:21 pm
Wohnort: Portugal

Re: Hi From Portugal and my “new” NX 250

Beitrag von Petrus » Do Jul 20, 2017 5:09 pm

Wow!

Great explanation! Even for a dumb, like me! :D

Will do the test and report. At the end, turn fully retracted, more 1/8 to lock and that's all :mrgreen:

I Got a feeling (like Black Eyed Peas) that the problema is the chain. Just a guess. :oops: :oops: :oops:

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Petrus
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Registriert: Mo Dez 05, 2016 12:21 pm
Wohnort: Portugal

Re: Hi From Portugal and my “new” NX 250

Beitrag von Petrus » Di Jul 25, 2017 9:22 am

Updating:

The good:
Checked oil filter and was clean. No metal shavings at all.

The rest:
Inspected tensioner per the manual and it works but I don’t know if it works perfect or not! Would be nice to have another to compare! I can hardly move the rod with my hand but with a screwdriver it works just fine.

Mounted it fully retracted… plenty of noise (rattle). Turned it counter clockwise about 2 turns… no noise. Went for a ride (about 10 minutes) and the noise came again! The rod went to the retracted position!

Btw, the chain seems to be fine or having little wearing (to my eyes).

Don’t know what to do! Buy only a new chain tensioner? Buy a new chain too? Try “the grease fix”?

Bike is now with a good friend of mine (part-time mechanic) and he will do a closer look. In the worst scenario, I will buy both parts, he will do the job and, at the same time, adjust valves, if needed.

Just for curiosity, this is the rattling: :oops:


https://youtu.be/lM5gf07Lk1E

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scrambler
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Re: Hi From Portugal and my “new” NX 250

Beitrag von scrambler » Mi Jul 26, 2017 8:08 am

tough decision - I guess it comes down to how much time and effort you want to spend right now. If you apply massout's fix it won’t have any bad side effects and you could change the timing chain in 1-2 years (just like I did). Or you could try it first with a new tensioner, just because changing the chain is way more effort – if the rattle continues even with a new tensioner you could still try massout’s fix (with the old tensioner, of course).

Bytheway, I will also soon post a “how to change the timing chain” ;)

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Petrus
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Registriert: Mo Dez 05, 2016 12:21 pm
Wohnort: Portugal

Re: Hi From Portugal and my “new” NX 250

Beitrag von Petrus » Mo Aug 07, 2017 9:19 am

Me happy! :D

With a new tensioner the engine is so quiet as ever. Money well spent, even if it was a bit pricey! :oops:

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