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VVC Link Shaft Problem 
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Joined: Sun Oct 19, 2014 10:10 pm
Posts: 809
Location: Bristol
GTM: Spyder
Post VVC Link Shaft Problem
I've been rebuilding a VVC engine to go into my Spyder when its done.

I've been having a problem with the VVC timing/function. I'd spent ages getting all the timing marks sorted and lined in then re-assembled the cam ladder back on the head. The hydraulic control unit plunger is supposed to be moveable by hand (or compressed air blown into the cylinder) but mine was really stiff and was sticking firm at certain parts of the throw. This was with the cam belt off and the inlet cam all pointing up so no valve spring pressure interfering.

Eventually I took the cam ladder back off and disassembled it again, this time I had a real close look at the link shaft. (previously I left it taped to the cam ladder as instructed by one of the web guides).

I found a couple of the teeth are knocked out of line. Can't imagine what could have done it, must have been knocked pretty hard.

Photos:
Attachment:
VVC Shaft 1.jpg
VVC Shaft 1.jpg [ 254.74 KiB | Viewed 3568 times ]

Attachment:
vvc shaft 2.jpg
vvc shaft 2.jpg [ 245.89 KiB | Viewed 3568 times ]


I thought about trying to knock them back or grind them smooth but found a shaft on ebay fairly cheap so have ordered that.

I guess the moral is to check everything when you have the chance. All part of the fun of used engines I guess...


Sun Nov 08, 2015 2:32 pm
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Joined: Mon Jul 06, 2015 8:26 pm
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Location: Chorley, Lancashire
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Post Re: VVC Link Shaft Problem
Good find, both the damaged shaft and the replacement :)

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Sun Nov 08, 2015 4:07 pm
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Joined: Sun Oct 19, 2014 10:10 pm
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Location: Bristol
GTM: Spyder
Post Re: VVC Link Shaft Problem
Attachment:
VVC shaft new.jpg
VVC shaft new.jpg [ 421.44 KiB | Viewed 3529 times ]


New (to me) shaft arrived today. Looks in great condition. I can recommend ebay seller oldmech1943


Wed Nov 11, 2015 2:53 pm
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Joined: Wed Aug 11, 2010 9:27 am
Posts: 436
Location: Sheffield
GTM: Libra
Post Re: VVC Link Shaft Problem
Out of interest can you tell me how many teeth does the gear on the end have and the OD of it please?

SAS

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2000 GTM Libra 1.8VVC 145BHP


Thu Nov 12, 2015 12:10 pm
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Joined: Sun Oct 19, 2014 10:10 pm
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Location: Bristol
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Post Re: VVC Link Shaft Problem
sidewinder wrote:
Out of interest can you tell me how many teeth does the gear on the end have and the OD of it please?

SAS


OD is 15mm (not 100% accurate - just using a tape measure, not calipers), 17 teeth.

What are you planning?


Fri Nov 13, 2015 10:05 am
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Joined: Sun Oct 19, 2014 10:10 pm
Posts: 809
Location: Bristol
GTM: Spyder
Post Re: VVC Link Shaft Problem
Shaft is in, timed up, and the cam ladder back on now. The HCU can now turn the shaft and in turn the VVC mechs by blowing air into the oil temp sender hole with a tyre pump so all seems to be as it should be now. :D


Fri Nov 13, 2015 10:08 am
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Joined: Wed Aug 11, 2010 9:27 am
Posts: 436
Location: Sheffield
GTM: Libra
Post Re: VVC Link Shaft Problem
Ok thanks, too small.

It was for something completely not car related. Move along :)

SAS

sanzomat wrote:
sidewinder wrote:
Out of interest can you tell me how many teeth does the gear on the end have and the OD of it please?

SAS


OD is 15mm (not 100% accurate - just using a tape measure, not calipers), 17 teeth.

What are you planning?

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2000 GTM Libra 1.8VVC 145BHP


Fri Nov 13, 2015 12:54 pm
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