I'm putting a 4mg fuel pump on a 3zj, both are b'models.. My question is whether or not each timing advance will interchange with the other pump.. The 4mg is a 4 bolt and the 3zj has 8 bolts where they bolt to the fuel pump.. Can the 8 bolt advance be used and just leave the other 4 bolt holes open???
The only other difference I see is with the center shaft in the back, where the older 4mg advance has 4 small holes and the 3zj doesn't, also the 3zj advance has a 9/16 bushing I guess and the other doesn't.. I'm sure there both hydraulic advance and return, but the 4mg engine hasn't seen oil pressure in a few years, and the center part that the weights are attached to is loose and kinda flopping around in there, so I ain't sure about it really??? I know the 8 bolt works because I've been running it, and it looks less worn overall, but I'm not gonna mix them up till I find out for sure..
I've got a service manual, but its for a 7fb, so no good in this case.. :bang
I know Tony has already wrote a good article on all this, but I can't find where I saved it, and it seems to be deleted from the original thread.. :madpoke
It would be cool if somebody could repost it here, if Tony doesn't mind of course.. :thumbsup
So what's up Tony, you got your ears on? Help! Help! :fan
The only other difference I see is with the center shaft in the back, where the older 4mg advance has 4 small holes and the 3zj doesn't, also the 3zj advance has a 9/16 bushing I guess and the other doesn't.. I'm sure there both hydraulic advance and return, but the 4mg engine hasn't seen oil pressure in a few years, and the center part that the weights are attached to is loose and kinda flopping around in there, so I ain't sure about it really??? I know the 8 bolt works because I've been running it, and it looks less worn overall, but I'm not gonna mix them up till I find out for sure..
I've got a service manual, but its for a 7fb, so no good in this case.. :bang
I know Tony has already wrote a good article on all this, but I can't find where I saved it, and it seems to be deleted from the original thread.. :madpoke
It would be cool if somebody could repost it here, if Tony doesn't mind of course.. :thumbsup
So what's up Tony, you got your ears on? Help! Help! :fan