Ford Edge 3.5 P0016 after water pump replacement
A recent support request was sent in for this 2010 Ford Edge with a 3.5L V6 engine DOHC with one VCT actuator and sensor per bank:
The water pump was leaking through the weep hole passage in the block. This engine has a water pump driven by the timing chain and a passageway in the block to allow for coolant that leaks past the primary seal to exit the engine without entering the crankcase. The timing cover was removed, and the water pump was replaced with an aftermarket water pump. The timing cover was resealed and the remainder of the engine reassembled.
After a long road test, the MIL came on and stored a DTC P0016 Crankshaft and Bank 1 Camshaft correlation fault. There were no codes or warning lights on before the water pump issue. Suspecting there was an issue with the aftermarket water pump the vehicle was disassembled and a factory water pump, a bank 1 cam phaser, a bank1 cam sensor and a chain were all installed. This should cover all the possible issues. The vehicle was reassembled and road tested again.
Still having issues with the same dtc, the shop was unsure how to proceed. We looked at the live VCT data and bank1 cam showed -15° and bank 2 cam showed 10° Suspecting the cams were out of time further inspection was needed.
Referencing service information showed that the timing has dimples on the phasers (cam gears) and a dimple on the crank gear. The crank gear can be installed in two orientations with the timing dimple aligning in the same spot on both sides. This is not the issue. The links between the painted marks on the cams and crank have the correct number of links, 38 between the bank1 (RH) cam and the bank 2 (LH) cam. There were also 27 links between the marked links from the bank1 cam and the crank. This is the correct timing setup. The crank pulley was reinstalled to allow for a scope capture of the timing.
diag.net/file/f44ts6mdk… This showed the -15° offset of the bank 1 cam. This initial scope pattern does not show the bank 2 cam because + & - of the bank 1 CMP were tested.
diag.net/file/f4ym23em0… Compared to the known good form.
There is an issue with the bank 1 timing. But what? The phaser was removed and inspected, no issues with the mounting of the cam gear, the L phaser is installed on bank2 and the R phaser is installed on bank 1.
A compression test was performed to verify if timing was mechanically out. There was not a transducer available, but the bank 1 and bank 2 compression readings were very consistent at about 185 psi.
Further inspection of the Cam 1 trigger wheel revealed a small witness mark. It seems that during the original water pump replacement the chain from the engine support may have caught the trigger and caused misalignment. Manually adjusting the trigger and rechecking the wave form with the scope returned the scope pattern to normal for bank 1. The shop chose not to correct the minor alignment issue of the bank 2 trigger as it was not setting a code.
Nice job. So the "shop" replace the timing components and second water pump because they felt they needed the practice?
I was not involved in the first two visits, I assume they figured it was something that failed because it was touched and proceeded with the blanket repair to cover the bases with out a complete diagnostic. I am unsure as to what parts of this were charged and what was covered by the shop. In the end the vehicle was fixed. Isolating the actual fault, through verifying what was good, led them to
Eric I spoke with the shop and found they had reports of machining issues with non oem water pumps not being build to the same tolerances as the factory pumps. A slight change in pulley location or diameter will effect timing. This is why they opted to reopen the engine for the second water pump. When disassembled, there was a measurable difference in the water pump.
In regards to "...have caught the trigger and caused misalignment. Manually adjusting the trigger...." Any pictures of that? No clue what this looks like in there. Thank you.
The link below is a video from Matco showing their cam timing holding tools. At about 8 seconds you can see the trigger wheel on the intake cam. Its a small press fit ring on the back end of the camshaft. youtu.be/WRzQ5c1YIsY?t…