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Forum: Diesel Discussion

08-28-2020, 01:09 PM

Replies: 13

Help interpreting OM603/300TD vacuum readings from VCV to BFS

Views: 1,037

Posted By 240dddd

To wrap this up, I got a used BFS and the problem...

To wrap this up, I got a used BFS and the problem resolved itself. I have the correct vacuum readings all around now :)

Forum: Diesel Discussion

07-27-2020, 04:53 PM

Replies: 13

Help interpreting OM603/300TD vacuum readings from VCV to BFS

Views: 1,037

Posted By 240dddd

Ack. Agree with what you say and confirm that I...

Ack. Agree with what you say and confirm that I have everything connected as per the diagram (including the green orifices).

Is there any way to 'bench test' the BUFO with the mighty-vac? I.e. if...

Forum: Diesel Discussion

07-26-2020, 05:05 PM

Replies: 13

Help interpreting OM603/300TD vacuum readings from VCV to BFS

Views: 1,037

Posted By 240dddd

After some more tests I *think* I've isolated the...

After some more tests I *think* I've isolated the issue to the BUFO:

Things I blocked/Bypassed
1. I've bypassed the Y29 switchover valve
2. I blocked off the feed to the vacuum reservoir
3. At...

Forum: Diesel Discussion

07-26-2020, 02:05 AM

Replies: 13

Help interpreting OM603/300TD vacuum readings from VCV to BFS

Views: 1,037

Posted By 240dddd

Forgot to mention I did both those things in my...

Forgot to mention I did both those things in my latest round of testing without seeing any change to the low vacuum coming into the the BUFO.

I'll keep trying some things but I'm not sure what...

Forum: Diesel Discussion

07-25-2020, 11:55 PM

Replies: 13

Help interpreting OM603/300TD vacuum readings from VCV to BFS

Views: 1,037

Posted By 240dddd

Got it. So for some reason the vacuum going into...

Got it. So for some reason the vacuum going into the BUFO is far less than "full system vacuum". The vacuum drops when I connect the VCV (even though the output of the vcv looks healthy). Would this...

Forum: Diesel Discussion

07-25-2020, 11:26 PM

Replies: 13

Help interpreting OM603/300TD vacuum readings from VCV to BFS

Views: 1,037

Posted By 240dddd

The problem with low vacuum at #8 goes back to Y...

The problem with low vacuum at #8 goes back to Y connector on top of the VCV, #1 based on my marking, also labeled 61a in the original chart.

Basically, as soon as I plug that Y connector into the...

Forum: Diesel Discussion

07-25-2020, 01:15 PM

Replies: 13

Help interpreting OM603/300TD vacuum readings from VCV to BFS

Views: 1,037

Posted By 240dddd

Great feedback, thanks To clarify,...

Great feedback, thanks

To clarify, when you say this do you mean feeding the line from the ALDA directly into the bottom center of the BFS?

Forum: Diesel Discussion

07-25-2020, 01:33 AM

Replies: 13

Help interpreting OM603/300TD vacuum readings from VCV to BFS

Views: 1,037

Posted By 240dddd

Help interpreting OM603/300TD vacuum readings from VCV to BFS

I'm getting weak vacuum (around 2-3 hg) to the transmission in my 87 300TD. I've taken some vacuum readings at different points but I'm not sure how to interpret them. I'm hoping someone might be...

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