2000 mercury mountaineer 4.0l sohc

[Ke7joi]

Ok folks here is my problem, while rebuilding my engine I put the left front timing chain gear on the jackshaft backwards and messed up a cam and 3 valves. In the left head and I fixed that problem. The engine ran about 120 miles with no problem. Then the cam slipped time at the front left cam for the second time. What have I missed or done wrong?

 

[2000StreetRod]

assembly instructions

If you PM me your email address I'll send you a copy of the SOHC V6 assembly instructions.

 

[Ke7joi]

Could this be a torque to yield problem older block new head and cam

 

[2000StreetRod]

reusing T-t-y bolts

Some of the bolts are torque-to-yield and should not be reused. The following thread provides torque specifications and identifies t-t-y bolts: SOHC V6 Torque Specifications

 

[rb142]

Yeah, if you ate reusing TTY bolts then you aren't getting the proper torque and running a big risk of breaking those bolts off in the part (ususaly not good places to deal with broken bolt removal). But if it is moving around as described, one of those gears is loose and slipping.

 

[Ke7joi]

Does the left camshaft to gear use torque to yield

 

[rb142]

No, the camshaft bolts should be OK. Note that the right side is left-hand thread.

The crankshaft damper bolt IS torque to yield. As I recall, the jackshaft bolts (both ends) may also be TTY.