F4.6 new liner/piston question

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Savagehoarder
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F4.6 new liner/piston question

Post by Savagehoarder » Mon Nov 30, 2015 9:36 pm

Hey everybody first post haha check my sig for my rigs, anyways I just picked up a new piston/liner for my f4.6 and before putting it in I noticed the piston doesn't go to TDC, it gets stuck right before TDC. Is there something I have to do to make the piston move more freely? Is it supposed to do this? The reason I ask this is because I have a new f4.6 that I've never started and the crankshaft rotates freely like one would think it should. I also just put a new piston/liner in my S25 and it gets to TDC just fine. Heellllpp!!
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badboy
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Post by badboy » Mon Nov 30, 2015 9:52 pm

Before your engine is broken in there should be a lot of pinch. I would recommend preheating your engine to 180-200f before starting. The heat will loosen the pinch. You could also loosen the glow plug 1/4-1/2 turn and then retighten after the engine starts.
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Post by Savagehoarder » Mon Nov 30, 2015 10:06 pm

That's what I thought because when I heated the block with the liner in, it would spin a little more free, but still bonded up. What confuses me is how do you preheat the block on the truck without damaging anything else?
Savage 25 w/F4.6
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Savage X w/K5.9

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badboy
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Post by badboy » Tue Dec 01, 2015 7:39 am

I use a heat gun. Apply heat straight down the cooling head and occasionally rotate around. Just don't hold it to close or in one spot for to long. Some people use a hair dryer.
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Post by Savagehoarder » Tue Dec 01, 2015 7:08 pm

Perfect I'll give that a shot thanks
Savage 25 w/F4.6
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Savage X w/K5.9

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Post by Savagehoarder » Sun Dec 06, 2015 9:23 pm

OK well that worked wonderfully thanks! Got two tanks out the engine and called it quits today, although while it was running it was bubbling and spitting out fuel from between the heat sink and top of block, engine ran great the whole but time but couldn't figure out why it was doing this. It was doing it before I replaced the sleeve/piston aswell, possibly need a new head?
Savage 25 w/F4.6
Savage X w/F4.6
Savage X w/K5.9

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