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Author Topic: Help with possible head gasket problem  (Read 1591 times)

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Offline katana

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Re: Help with possible head gasket problem
« Reply #40 on: February 01, 2018, 09:10:17 am »
Now you are asking me to take responsibility...   :imaposer:

If the motor doesn't fire, and the cams, barrel, etc are not dry, I would have just cranked it to get the oil pump primed.  If you can't get the check screw out it is a moot point anyway.
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Offline GEE-SH

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Re: Help with possible head gasket problem
« Reply #41 on: February 01, 2018, 09:35:17 am »
Daai oil pressure relief valve of oil check valve sit gewoonlik baie vas, maar kom gewoonlik met n impact driver uit, moet net nie die slot strip nie dan gaan jy eers vloek en jouself baie jammer kry  ;)
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Offline Jughead

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Re: Help with possible head gasket problem
« Reply #42 on: February 01, 2018, 09:55:52 am »
You need an extended tip for the impact driver.

Take an old 8mm allen key and cut about 90mm off.  Shape the end to a screwdriver tip on the grinder and Bob's your uncle.
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Offline Dunnes

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Re: Help with possible head gasket problem
« Reply #43 on: February 07, 2018, 09:37:20 pm »
You need an extended tip for the impact driver.

Take an old 8mm allen key and cut about 90mm off.  Shape the end to a screwdriver tip on the grinder and Bob's your uncle.

Thanks Jughead. I did exactly that and it worked.

Now, I put the bike back together. Well, about three times. First time, the plastic chain guide I replaced wasn't seated well. The second time I was one tooth out on the timing.

After the third time I went for a ride. There was a loud clacking noise, which went away when I gave it the beans, but as the engine got to operating temperature the clacking sound continued.
I thought it might be the timing chain tensioner that got stuck or isn't working well. When I inserted into the engine, I had to use considerable force to get it in there. I think the cylinder it runs in has some corrosion from the watery oil.

So I took out the tensioner and had a look at it. The spring inside is still working, but I wouldn't know if its tight enough as I need a new one to check. The chain gang site says the following:
If its tiny check valve is leaking slightly, it will reseat and allow you to install the Large Bolt easily. If it's not leaking, it may seem too long to re-insert and install the Large Bolt. You must de-pressurize it by looking in the opening, finding the tiny ball bearing check valve, and pressing it open with a pin to allow oil to leak out. This will allow it to shorten enough to install the Large Bolt. If you think you have a problem with noise from a loose cam chain, especially at start-up or low oil pressure, or find wear on the chain guides, this is one of the parts to consider replacing.

If I can press it in with some pressure and it releases easily, does that mean the valve is leaking?

I also read on advrider (http://advrider.com/index.php?threads/help-bmw-f650-cam-chain-tensioner-klicking-noise.968275/) that I need to fill the tensioner with oil as a air pocket can cause it to not pressurize. In the photo I added, do you just fill some oil in the right hand side or do you need to fill the inner part of the cylinder with oil?

Thanks again
 

Offline Dunnes

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Re: Help with possible head gasket problem
« Reply #44 on: February 07, 2018, 09:38:45 pm »
Now you are asking me to take responsibility...   :imaposer:

Ja nee, I suppose i was trying to do that. Eks skuldig
 

Offline katana

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Re: Help with possible head gasket problem
« Reply #45 on: February 07, 2018, 09:47:13 pm »
Now you are asking me to take responsibility...   :imaposer:

Ja nee, I suppose i was trying to do that. Eks skuldig
Ek haat dit die meeste as ek op my eie goed werk  :thumleft:
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Offline Jughead

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Re: Help with possible head gasket problem
« Reply #46 on: February 08, 2018, 07:13:30 am »

If I can press it in with some pressure and it releases easily, does that mean the valve is leaking?


Yes,  you should not be able to compress it at all if the check/one way valve is seating correctly and it is filled correctly.  You will however be able to compress it if it has air in it.


I also read on advrider (http://advrider.com/index.php?threads/help-bmw-f650-cam-chain-tensioner-klicking-noise.968275/) that I need to fill the tensioner with oil as a air pocket can cause it to not pressurize. In the photo I added, do you just fill some oil in the right hand side or do you need to fill the inner part of the cylinder with oil?


Stand the tensioner upright with the open end up.  Fill it with oil (only takes around 10 drops to fill the inner piston)  and make sure the piston is well oiled in the sleeve.

Using something like a small ball end allen key (So that you don't damage the ball) push the piston down, pushing on the check valve.  You will see air being pushed out.  Now release the piston slowly and you will see the oil you filled it with disappear.  Fill the piston again (another 10 drops) and repeat until the oil in the piston no longer disappears and no more air is expelled.  The chamber below the piston is now full of oil.

Wipe it off with a clean rag and just using finger pressure, try to compress the piston.  You should not be able to do it by hand.  If that is the case, the tensioner is working and sealing correctly.  If you can still compress it, the valve is leaking and you will have to replace the unit.

You may have an issue fitting it back like this, as you link explains.  What you can do is, hold it upside down and, once again using your ball end allen key, push the piston in halfway and release it.  This will expel some of the oil and introduce a little air.  You should now be able to replace it.  The small amount of air will be expelled and replaced with oil as the oil pressure builds up and the tensioner starts working.

It does appear that you have the old style tensioner there.  New one looks like this, and I do have it from the donor motor.
« Last Edit: February 08, 2018, 07:16:09 am by Jughead »
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Offline Dunnes

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Re: Help with possible head gasket problem
« Reply #47 on: February 08, 2018, 08:02:16 am »
Thank you Jughead! I will test it later today.

I found another post on advrider regarding the tensioner. It seems there is a difference in length between the old and the new parts as below.
Old one left and new one right:


I believe if I use the new tensioner, I should also use the new plug. Do you perhaps have the plug too?
 

Offline Jughead

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Re: Help with possible head gasket problem
« Reply #48 on: February 08, 2018, 08:25:15 am »
I should also use the new plug. Do you perhaps have the plug too?

Yes, I do have the plug too.
« Last Edit: February 08, 2018, 08:46:06 am by Jughead »
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