LB7 FPRV Shim mod - Diesel Bombers



 
 
 
 
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Old 10-21-2009, 07:51 PM
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Default LB7 FPRV Shim mod

The lb7 motor as a FPRV just like the lly and lbz motors, except its in a harder to get to location and most of the time its not needed anyway.

The location of the FPRV is located on the fuel junction block in the middle of the valley underneath the metal turbo inlet. The easiest way to get to is it by removing the AC compressor, Thermostat housing and Turbo inlet and you will have a good view of the FPRV.













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LB7 FPRV Shim mod-dscf0044.jpg   LB7 FPRV Shim mod-dscf0045.jpg  
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Old 10-21-2009, 07:57 PM
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In the last Picture you can see the return line Tee and Banjo bolt, the Banjo bolt threads into the FPRV. To remove the FPRV undo the 10mm strap holding it in place and hold the FPRV with a 24mm wrench while removing the banjo bolt in the return line Tee with a 19mm wrench.

Here is a pic of it removed.







Now to Take it apart you will need a 5mm Allen wrench and a vice, or something comparable.



Thh contents are spring loaded so be careful when taking the FPRV apart.



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LB7 FPRV Shim mod-dscf0046.jpg   LB7 FPRV Shim mod-dscf0048.jpg   LB7 FPRV Shim mod-dscf0050.jpg   LB7 FPRV Shim mod-dscf0051.jpg   LB7 FPRV Shim mod-dscf0052.jpg  

LB7 FPRV Shim mod-dscf0053.jpg  
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Old 10-21-2009, 08:02 PM
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Now What i used to shim them with are two M4 washers i got from ace hardware, they fit perfectly in the cap and they are roughly .030" thick each.







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LB7 FPRV Shim mod-dscf0058.jpg   LB7 FPRV Shim mod-dscf0060.jpg   LB7 FPRV Shim mod-dscf0061.jpg   LB7 FPRV Shim mod-dscf0063.jpg   LB7 FPRV Shim mod-dscf0064.jpg  

LB7 FPRV Shim mod-dscf0065.jpg   LB7 FPRV Shim mod-dscf0066.jpg  
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Old 10-21-2009, 08:04 PM
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Reassemble everything back together as in the last pic in the post above.




And reinstall the FPRV and get back to driving again.
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LB7 FPRV Shim mod-dscf0071.jpg  
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Old 10-21-2009, 08:14 PM
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Nice Write up ! Thanks
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Old 11-02-2009, 11:15 PM
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what gains dose this give you?
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Old 11-02-2009, 11:18 PM
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Old 11-02-2009, 11:27 PM
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Quote:
Originally Posted by rosscup View Post
what gains dose this give you?

if your FRPV is popping from running high rail pressure adding shims will keep the valve in its seat so it can hold the higher pressure
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Old 11-02-2009, 11:37 PM
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Thanks Danny Been looking to do this
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Old 11-02-2009, 11:41 PM
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one tip to get that FPRV out is unbolt the steel return line from the passenger side head and at the steel clamp under the GPCR next the to quick disconnect to give it a little flex so you can unbolt the FPRV easier without seriously bending the steel line.

trust me you want to do that
 
 
 

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LB7 FPRV Shim Mod ??? - Duramax Diesels Forum This thread Refback 04-09-2010 10:01 PM
Horsepower estimation - Page 3 - Diesel Place This thread Refback 11-20-2009 07:06 PM
Need a diagnosis - Page 3 - Duramax Diesels Forum This thread Refback 11-16-2009 09:24 PM
Horsepower estimation - Page 2 - Diesel Place This thread Refback 11-04-2009 12:55 PM

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