Originally Posted by Milwaukee
I don't use inside building because there air compressor with air hoses.
But I use electric impact for junkyard or remove tires in outside.
$4,000 to do that timing chains. That customer is SMART to have mechanical insurance on it.
another question what exact cause timing chain's sprocket wear out FAST.
it 89 F150 with new block 5.0L 302 in 1998 so it have 10,000 miles. We knew it was 10,000 miles how it was clean. But notice timing chain actual too loose for me. Notice Sprocket on camshaft look bad shape.
Oil it was 10w30 with Bastard Junk Fram oil filter.
And preview owner is 19 years old so I bet it been hit 5,000 or 6,000 rpm and never drove on Highway with those miles.
Aluminum casting cam sprocket with molded nylon teeth like Catty's post#14, wear fast. Back in my engine rebuilding day, I saw a pile of worn out cam sprockets on the floor of the tear down dept, where I used to ground crankshafts, asked a foreman shop, why the molded nylon sprockets? He said these sprockets were designed to reduce noises. Flawed design. The molded nylon teeth became harden and break due to heat or wrong oil maybe fuel dilitued in oil (Flooded carburetor). If you put a new t-chain kit ( include cast iron or steel sprockets) in OHV block, notice a chain became a tight, then the t-chain will stretch. Normal. Nothing wrong with loose t-chain. Link type chain stretch big than roller type chain. I think the molded nylon cam sprockets are no longer in modern OHV engines. Maybe Im wrong?