Anto
03-17-2009, 10:33 PM
I just did the 248/232 cam swap on my 1993 coupe with a KA.
I redrilled the cam gear for +2.5 degrees of advance on the intake side, and rotated the cam gear 4 teeth CCW (per instructions).
I reassembled the timing chain per factory manual, lined up the silver links on the chain with the indents on the cam gears (with the exception of the 4 teeth CCW) and lined up the 3rd silver link on the chain with the indent on the lower idler pulley.
I then set TDC on the motor, and the distributor rotor at the #1 cylinder firing position. Reassembled everything back together, and cranked the motor. It spins perfectly fine.
When I start it, there is a LOUD rattling noise coming from the valve cover area. The sound is proportional to the engine RPM, if I rev it a little bit the rattling noise gets faster. The motor also runs choppy.
I pulled the valve cover and rechecked everything, it seems correct but I know somethings off. Fearing bent valves, I compression checked the motor and it's showing 230psi in all cylinders. Both the recalled factory chain guides are taken off.
WTF? Any ideas?
I redrilled the cam gear for +2.5 degrees of advance on the intake side, and rotated the cam gear 4 teeth CCW (per instructions).
I reassembled the timing chain per factory manual, lined up the silver links on the chain with the indents on the cam gears (with the exception of the 4 teeth CCW) and lined up the 3rd silver link on the chain with the indent on the lower idler pulley.
I then set TDC on the motor, and the distributor rotor at the #1 cylinder firing position. Reassembled everything back together, and cranked the motor. It spins perfectly fine.
When I start it, there is a LOUD rattling noise coming from the valve cover area. The sound is proportional to the engine RPM, if I rev it a little bit the rattling noise gets faster. The motor also runs choppy.
I pulled the valve cover and rechecked everything, it seems correct but I know somethings off. Fearing bent valves, I compression checked the motor and it's showing 230psi in all cylinders. Both the recalled factory chain guides are taken off.
WTF? Any ideas?