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Still runs like crap but the knocking is gone. Still popping tho so I'll check the valves. I took this video of it for your viewing pleasure. Let me know if you see something off
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@SPArKy_Dave What's the torque spec for the rocker arm bolt?
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By SPArKy_Dave · Posted
Look for loose rockers If ur keen to go further, unbolt/remove the intake rockers, then (firmly) tap each valve stem with a nylon/soft blow hammer. (using a normal steel hammer will damage/mushroom the valve stem tip) Tap hard enough, to slightly compress the spring/bounce the valve off it's seat and back. Listen to the note. You'll hear any stuck valves. -
I'll pull the cover tomorrow. What specifically should I look for?
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By SPArKy_Dave · Posted
That's 100% a stuck intake valve/valve not sealing. Just need to confirm which cylinder. Have u pulled the rocker cover yet? After sitting for yrs, my XF wagon had x3 stuck intake valves. With alot of patience, I attempted to free them using penetrene down the valve stem, and a nylon hammer. That partially worked. In the end, I removed the spark plug/s, and using a drinking straw as a feed/guide, fed a whole heap of thin nylon rope (from bunnings) into each problem cylinder, leaving the rope end sticking out the spark plug hole. Next I rotated the engine, so the piston sandwiched the rope against the underside of the valves. With that done, I removed the valve spring, wrapped the valve stem in some tape as protection, then fitted a cordless drill to the exposed valve stem and ran the drill back and forth with more penetrene down the valve stem/guide. Doing the above, eventually got them loose. Ur carburettor is ok. RPM's will always increase with a vacuum leak - ur introducing extra air into the engine, same as opening the throttle. -
I just checked for crossfire but didn't see any however I noticed that the engine revs go up significantly when I pull a vacuum line. Could a fucked up carby cause any of this?
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The dipping in vacuum is in sync with the popping so I think a sticky valve is possible
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Yeah I'll get a vid of the vaccum gauge but it does seem to be jumping at idle and cylinder 1 seems to do nothing. It is making a rattle at the front of the engine aswell. For the crossfire test do I just spray water at the dizzy?
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By SPArKy_Dave · Posted
They clatter like nobody's business. Could be a sticky intake valve, but I'd expect to hear valve-train ticking? A vacuum gauge, would show a sticking intake valve as momentary positive pressure. (needle would flicker to low vacuum)
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