2f rebuild-opinions wanted

[missipboy]

i got a 2f from a mudmember for free. he said it was using a little bit of oil. i tore into it and found the # 5 cylinder slightly scarred. all the pistons have wear marks on at least one side and the # 5 piston has some scarring on it below the rings. the ring, surprisingly, was not broken. a friends dad who has built his share of chevys says i should just hone it and replace the rings. he has no experience with toyota six, though. i would love to do this as i don't have the money for boring it and buying new pistons. have any of you had success doing it this way?

some pics of the wear marks on the pistons.

 

[Mace]

how deep are those grooves?

Personaly I would be of the "hone it and go on your way" train of thought..

 

[missipboy]

they're not that deep.

thanks. that's all i needed to hear.

 

[Mace]

"not all that deep" is subjective.

Can you feel them with your fingernail?

 

[Nicholas32]

how deep are those grooves?

Personaly I would be of the "hone it and go on your way" train of thought..

x2 the peace of mind alone is worth the money

 

[grant5127]

i don't have the money for boring it and buying new pistons.

With that statement in mind... the only way out is to hone the cyls. clean up the pistons really well and use crocus cloth to smooth out the scuffs on the skirts.... reassemble with new parts as $$ allows.....

 

[missipboy]

can't really feel it with my fingernail.

my f is still running so, maybe i'll rebuild it slowly with new parts. peace of mind is a nice thing to have.

 

[Trollhole]

i got a 2f from a mudmember for free. he said it was using a little bit of oil. i tore into it and found the # 5 cylinder slightly scarred. all the pistons have wear marks on at least one side and the # 5 piston has some scarring on it below the rings. the ring, surprisingly, was not broken. a friends dad who has built his share of chevys says i should just hone it and replace the rings. he has no experience with toyota six, though. i would love to do this as i don't have the money for boring it and buying new pistons. have any of you had success doing it this way?

some pics of the wear marks on the pistons.

Looks like my 2f when I took it apart. #5 was the culprit. I wonder why?


Are the pistons original size? If so I'll send you one of mine free.

What did your bearings and lifters look like? ANy idea on milage?

 

[Degnol]

I also have a set of STD bore 2F pistons from an engine with 89K on it. LMK.
Postage only, BTW.

Ed

 

[grant5127]

Looks like my 2f when I took it apart. #5 was the culprit. I wonder why?

#5 gets the brunt of the bull****.... primary cause? the brake booster....

 

[missipboy]

bearings look pretty worn. it had about 230k on it, according to the po.

i appreciate the offer on the pistons. right now i think i'll take my time and buy new parts as the disposable income comes in.

 

[rsbcruiser]

did what you are suggesting

bearings look pretty worn. it had about 230k on it, according to the po.

i appreciate the offer on the pistons. right now i think i'll take my time and buy new parts as the disposable income comes in.

Funny you should ask missipboy. I basically just did a garage rebuild on my F engine. When I did it, my pistons and cylinders were in better shape than yours. One exception, a fingernail scratch in # 1. Motor recieved new cam, all new bearings, mostly new valve train. If you do garage hone, look into getting rings that have not been pre-gapped. I ran into that one. Even though the cylinders miked to a little less than max tolerance, the rings were already out of spec. I like your idea of slamming the f in there and then building the 2f right so you only have to do one more motor swap. Bet before I'm done I'll have 5 motor swaps. Crazy thing, # 1 hole had best ring sealing, me thinks I didn't hone the others enough.

 

[grant5127]

# 1 hole had best ring sealing, me thinks I didn't hone the others enough.

Or maybe too much on the others......

 

[missipboy]

the f is in it right now, so i'm good to go as far as engines for now. the trans is shot, though. i was kinda hoping to do it all at once, but looks like that's not gonna happen.

 

[Coolerman]

#5 gets the brunt of the bull****.... primary cause? the brake booster....

I have heard that said many times and wondered if this idea would solve that issue. Warning: Over thinking possibly ahead...



If you drilled and tapped the other boss on the intake, then used tubing of some sort to tie the two ports together would this not 'spread the vacuum load' between cylinders 1-2 and 5-6? I guess conceivably you could also drill into the center and spread the vacuum demand across all cylinders? That way it the booster leaked no one bank would be leaned out so badly.

 

[missipboy]

the things you learn on mud.........


if that's true and had been done this engine would probably still be running strong.