broken Crankshaft

[filh]

Hello ,
A friend of mine broke his crankshaft on a 4AGE . He has a 3 ribs block , and small journals.
He was told that it was a common failure .....

It's a rally car , he doesn't want to have the same bad adventure .

Here's the question : will a big journals crankshaft fit his 3 ribs block .
He will have to change rods to fit journals , but will these big rods fit the forged pistons he have ? Or does he have to change pistons too?

Are the main crankshaft bearing same on both parts ?

and the last one : does somebody has the Toyota part number for the big crankshaft. He asked his local dealer , but he only have the EPC , are there are no measurment on crankshaft

Do you have any replacement suggestion HKS Toda or else ?
I'v added a pic of his car , he's a spectacular rallye driver as you can see
(162HP weber 45 dcoe powered )

any help welcome
Regards
Filh

[Project D]

In french

Malheureusement pour lui il doit changer tout le bas moteur (bloc/vilbrequin/bielle/piston) pour celui d'un redtop, car rien n'est compatible...

[Bad_Dog]

13401-16020

[filh]

thanks for the part number .
in french :
<<<<D"après les infos que j'ai les paliers de vilebrequins sont les mêmes , seuls mes diamètres de maneton changent .
J'attends la suite<<<

Still waiting your further informations : will he have to change block and pistons, to have the big journals crankshaft ? (It's what he wants to have)
Filh

[S.K.]

Both axles have same main bearing size (48mm) and it fits straight in to 3 rib block.

What size piston pins he have? 18mm? 19mm? 20mm?
Most 42mm conrods have 20mm piston pin. I don´t think that there is a conrods that have 42mm lower hole and 18mm piston pin.

In here are many over 200hp 4A-GE rally engines and almoust all uses original (but balanced) 4A-GE 42mm cranshaft, including me.

[Jan Pedersen]

The problem isn't uncommon. Did he balance everything properly?

[F0Bman]

Tell him to get a billet Formula Atlantic one and call it a day. I have one if he's interested.

F0b

[jamiemirror]

Big crank will fit, requires big conrods and pistons.

Hi-rev requires precision balancing.

[firehawk]

S.K. Wrote:I don´t think that there is a conrods that have 42mm lower hole and 18mm piston pin.

I actually just discussed this with a fellow Toyota-enthsiast who's building a gr.F AE92 and he suspected that it may be possible that late-model 4A-FE engines could have a 42mm rod bearing and a 18mm interference-fit piston pin. I have absolutely no experience with 4A-FE engines so I can't say anything one way or the other. Anyone know more?

[S.K.]

firehawk Wrote:

S.K. Wrote:I don´t think that there is a conrods that have 42mm lower hole and 18mm piston pin.

I actually just discussed this with a fellow Toyota-enthsiast who's building a gr.F AE92 and he suspected that it may be possible that late-model 4A-FE engines could have a 42mm rod bearing and a 18mm interference-fit piston pin. I have absolutely no experience with 4A-FE engines so I can't say anything one way or the other. Anyone know more?

I have changed conrod bearings to one 98-99 Avensis 4A-FE engine, there was 40mm rod bearings... Don't know what size the piston pin was, because I did it under the car.
I take off the sump, change bearings and then put sump back...