Older Caterpillar® 3408 & 3412 engines use a valve bridge that rides on a dowel pressed into the cylinder head. Engines with the serial numbers listed below may utilize a valve bridge that does not ride on dowels; newer engines as well as HEUI engines use longer intake and exhaust valves. Affected serial numbers listed below (note this list may not be all inclusive so please consult the proper cataloging utilizing serial and arrangement numbers for more accuracy).
3408C: 1LG, 1TS, 2BG, 8RG, 9ER, 9TD, 9XM, 67U, 78Z, 99U
3412C: 2WJ, 3JK, 5RL, 7BL, 8AR, 9BR, 9XF, 38S, 60M, 81Z
3408E & 3412E: Both of these HEUI engines may utilize the longer valve
Difference in valve length as follows: (Distance measured from top of keeper groove to top of valve).
Failure to use the proper valve in the proper cylinder head will cause catastrophic failure!
IPD currently offers all of the above latest style valves for Caterpillar® and many other applications manufactured from up-to-date materials and dimensions. Using older valve designs or materials will put your reputation at risk! IPD offers a very complete and competitive valve train program for diesel and natural gas applications covering many applications, models, and manufacturers. Please see our website at www.ipdparts.com or contact your IPD Distribution Center, Regional or Area Manager for more details.
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