Cat diesel power!!!!

Will the strain the double springs put on a valve train accelerate the wear of cam lobes and rocker arm rollers? What do you DDS think may cause that backfiring? Thank you.

 

The spring load is higher with single to double, see below specs.... I have bench tested all springs and found aftermarket replacments to have about 10 ponds more pressure.



Single spring

102-7665 Spring Assembled length ... 66.0 mm (2.60 inch) Load at assembled length ... 389 ± 19 N (87 ± 4 lb) Operating length (minimum) ... 50.0 mm (1.97 inch) Load at minimum operating length ... 1077 ± 54 N (242 ± 12 lb) Free length after test ... 75.0 mm (2.95 inch) Outside diameter ... 36.90 mm (1.453 inch) The spring must be square with ends within the following dimension. ... 2.15 mm (0.085 inch)

Double Valve springs

175-7523 Spring (Inner) Assembled length ... 60.14 mm (2.368 inch) Load at assembled length ... 118 ± 12 N (27 ± 3 lb) Operating length (minimum) ... 44.02 mm (1.733 inch) Load at minimum operating length ... 356 ± 18 N (80 ± 4 lb) Free length after test ... 71.03 mm (2.797 inch) Outside diameter ... 25.20 mm (0.992 inch)

175-7526 Spring (Outer) Assembled length ... 67.12 mm (2.643 inch) Load at assembled length ... 248 ± 25 N (56 ± 6 lb) Operating length (minimum) ... 51.00 mm (2.008 inch) Load at minimum operating length ... 736 ± 35 N (165 ± 8 lb) Free length after test ... 77.88 mm (3.066 inch) Outside diameter ... 36.30 mm (1.429 inch)

211-3122 Spring (Inner) Assembled length ... 60.14 mm (2.368 inch) Load at assembled length ... 150 ± 12 N (34 ± 3 lb) Operating length (minimum) ... 44.02 mm (1.733 inch) Load at minimum operating length ... 400 ± 18 N (90 ± 4 lb) Free length after test ... 71.70 mm (2.823 inch) Outside diameter ... 25.20 mm (0.992 inch)

211-3123 Spring (Outer) Assembled length ... 67.12 mm (2.643 inch) Load at assembled length ... 320 ± 25 N (72 ± 6 lb) Operating length (minimum) ... 51.00 mm (2.008 inch) Load at minimum operating length ... 900 ± 45 N (202 ± 10 lb) Free length after test ... 76.70 mm (3.020 inch) Outside diameter ... 36.30 mm (1.429 inch)

Note: The 175-7523 Spring (Inner) should only be coupled with the 175-7526 Spring (Outer). The 211-3122 Spring (Inner) should only be coupled with the 211-3123 Spring (Outer). Use the same inner springs and the same outer springs on each valve bridge.

 

Great info, thank you DDS.

 

How many miles on the head, valve guides worn?

 

Over 320k, not sure about guides

 

Thanks for the spring info DDS. Are those spring part #'s Cat #'s?

 

Yes, Cat numbers.

 

hey DDS can you tell me who to contact to change fls/fts?

 

If you're located in Australia...........there are a few individuals there that can do this for you. Otherwise you'll have to ship the ECM to the US or Canada.

 

thanks mr haney, yes am in Aust. am really only chasing a password, have ET so really only need a password, can send an ecm over to states if need to but.