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TRNW TECH TIP OF THE MONTH!

The pressure regulator valve bore wear was severe enough to blow the D clutch drum apart!
ZF5-HP19 p-reg body (click to enlarge)
ZF5-HP19 Worn Pressure Regulator Bore!
This is an image of a ZF5HP19 pressure regulator valve body casting from a 2001 BMW 325i that had 135k on the vehicle. It had no reverse and the forward gears function normally, except it probably had no engine braking in manual low. I didn't check that prior to repair. The no reverse was caused by the D clutch housing (low/reverse) having the lugs blown off the end and the snap ring blown out. The probable cause of the blown drum was excessive pressure due to a worn main pressure regulator bore in the pressure regulator housing. You can see the linear wear in the bores and the edge wear in the one hole as well. The 5 land (second design) anodized main regulator valve looked and fit like new. The fix I used was to replace the housing with a new housing from ZF. This should give an image to compare too, should you need to check the bore on one of these, since this one was bad enough to blow the drum apart.
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INDUSTRY NEWS!
Adapt-A-Case has several new products to help make our life easier! Click here for more information!
TEMCO has agreed to offer TRNW members a 10% discount on all parts washers and detergents for the first 100 members who respond. Call 1-800-245-1869
Toledo Trans-Kit® is proud to announce the availability of the 5R110W TorqShift overhaul kits! Click here for more details!
Superior has introduced an extra thick valve body separator plate for 4R70W & 4R75W! Click here for more details!
Adapt-A-Case now offers a Torque converter alignment tool for 5R55N - 5R55W - 5R55S! Click here for more information!
Toledo Trans-Kit® offers a solution for delayed forward engagements on the 5R110W TorqShift transmission! Click here for more details!
Sonnax now provides a support plate for 4R70W and 4R75W valve bodies to prevent cross leaks and seperator plate damage! Click here for more info
Toledo Trans-Kit® now includes Air Bleed Filter Orifices in their 5R110W TorqShift overhaul kits! Click here for more details!
Sonnax has a new cutback valve and sleeve assembly for AW 450-43LE transmissions!
Superior Transmission Parts is proud to announce their new A618 / 48RE LOW & REVERSE SUPER SERVO! Click here for more info!
Adapt-A-Case is proud to introduce their new Output shaft nut Spanner Socket for Allison AT1000/2000/2400! Click here for more information!
Toledo Trans-Kit® offers a solution for torque converter clutch chatter and premature failure on the 5R110W TorqShift transmission! Click here for more details!
Sonnax has just come out with a Flanged Piston Damper Sleeve for Mitsubishi F4/R4A51 and F5/R5A51 transmissions! Click here for more details!
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TRNW today
Vehicles fixed in 2009:
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Fix Posted: 3/11/10
Complaint: E4OD, Droaning, dry bearing noise
Posted Fix:
Greased dust shield on rear seal
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Problem Posted: 2/05/10
Subject: 5R55S, Harsh 1-2 and 4-5 shifts. Shuttles 1-2-3-2
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(since 9/18/07)
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