So I'm finally getting around to putting my 440 together but I've came across another snag. I assume the arrow on the piston tells me to point it towards the front of the engine but in doing so the writing on the piston would be upside down. Might just be my ocd kicking in but seems odd to me but then again to have the writing up right the arrow would be pointing towards the back. Also there 2 numbers on the pistons. 4 of them start with an a and 4 of them start with a b, any ideas on that? I tried to Google it but no luck. Thanks for the advice!
440 piston question(s)
- Thread starter Deaken
- Start date
J. Cower
Well-Known Member
Mine was the same for the new pistons in my 340. Bothered me but checked everything and that's just how they were. Seems to be working fine.
wyrmrider
Well-Known Member
real easy to put the rod on backward to the piston direction are the rods numbered? correctly?
But do check and make sure each rod is on the right way if there is a little oil squirter that's a clue but you can do it with the slots for the bearing tangs
dbl check and see if the pistons have offset pins offsets all go the same way not different side to side
check the chamfer on the rod bearings and see that they go away from the other rod towards the outside of the journal
there is a logic to it but for a start treat each piston as a separate challenge
But do check and make sure each rod is on the right way if there is a little oil squirter that's a clue but you can do it with the slots for the bearing tangs
dbl check and see if the pistons have offset pins offsets all go the same way not different side to side
check the chamfer on the rod bearings and see that they go away from the other rod towards the outside of the journal
there is a logic to it but for a start treat each piston as a separate challenge
PurpleBeeper
Well-Known Member
Yep, go carefully & listen to wyrm. It is super easy to put the pistons on the rods backwards. In the last 6 months I've seen two engines with the heads pulled off showing the pistons in upside-down.
Anyway, yes, arrows towards the front of the engine PLUS make sure when doing this your connecting rods are all facing the correct way (by checking numbers on rods + rod bearing direction as wyrm says) to make sure the pistons aren't on the rods backwards or something...it happens.
Anyway, yes, arrows towards the front of the engine PLUS make sure when doing this your connecting rods are all facing the correct way (by checking numbers on rods + rod bearing direction as wyrm says) to make sure the pistons aren't on the rods backwards or something...it happens.
Bighead440
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Arrow to the rear for less friction, due to offset pins in OEM or "replacement" pistons (NOT racing pistons). Old racers trick. You must either press them on the rods backwards or swap pistons side-to-side as you reverse them, to keep the oilers on the rods pointing to the opposite cylinder wall, as intended for skirt lubrication.
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