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Forum: Diesel Discussion

08-01-2015, 01:59 PM

Replies: 39

1984 300CD VCV Valve Broken, options?

Views: 4,036

Posted By Zacharias

The entire purpose of the VCV is to bleed off...

The entire purpose of the VCV is to bleed off vacuum, so as to have the vacuum at 0 at the point when the car should shift. That is why it is there. If it is out of adjustment you will never get the...

Forum: Diesel Discussion

08-01-2015, 09:41 AM

Replies: 39

1984 300CD VCV Valve Broken, options?

Views: 4,036

Posted By Zacharias

I don't think you should be able to get the VCV...

I don't think you should be able to get the VCV to drop vacuum to zero by just moving the linkage while the car is running, stationary. It should only drop the vac to zero when the transmission...

Forum: Diesel Discussion

07-28-2015, 11:22 PM

Replies: 39

1984 300CD VCV Valve Broken, options?

Views: 4,036

Posted By Zacharias

On the non-adjustable ones I had, instead of a...

On the non-adjustable ones I had, instead of a nut there was what I would describe as a rivet or a 'blind bolt' with no way to adjust it, securing the spring.

Forum: Diesel Discussion

07-28-2015, 10:24 AM

Replies: 39

1984 300CD VCV Valve Broken, options?

Views: 4,036

Posted By Zacharias

I would assume that means the engine shock mount....

I would assume that means the engine shock mount. They are metal frames moulded with bushings and they deteriorate with age.

I missed the original post and what was being referenced to...

Forum: Diesel Discussion

07-27-2015, 08:43 PM

Replies: 39

1984 300CD VCV Valve Broken, options?

Views: 4,036

Posted By Zacharias

Yes I have seen the non-adjustable type. I had a...

Yes I have seen the non-adjustable type. I had a few VCVs in my accumulated parts... when I found out about adjusting, I opened them up and found two of the three were not adjustable. So much for...

Forum: Diesel Discussion

07-27-2015, 04:04 PM

Replies: 39

1984 300CD VCV Valve Broken, options?

Views: 4,036

Posted By Zacharias

My bad, I did not read this before my last reply....

My bad, I did not read this before my last reply.

The amount of vacuum going through the VCV should not affect your brake booster to that extent. When my vacuum pump diaphragm ruptured (old...

Forum: Diesel Discussion

07-27-2015, 02:09 PM

Replies: 39

1984 300CD VCV Valve Broken, options?

Views: 4,036

Posted By Zacharias

To check whether your issue is/was the VCV, you...

To check whether your issue is/was the VCV, you would need to get hold of a vacuum gauge and plumb it into the line going to the transmission modulator, with enough line to run it into the cabin and...

Forum: Diesel Discussion

07-27-2015, 12:04 PM

Replies: 39

1984 300CD VCV Valve Broken, options?

Views: 4,036

Posted By Zacharias

The VCV is actually a bleed-off valve. It is...

The VCV is actually a bleed-off valve. It is supposed to leak vacuum. That is what the outlet on the side is for.

As I have no idea what you were troubleshooting exactly, I can't offer other...

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