RWD - 3sg & 3y/4y Bellhousing questions

**assassin10000** · 03-07-2009, 03:08 PM

For anyone running a 3y/4y bellhousing on their 3s, what starter & dust shield/backing plate did you use?

Andrew

**stidnam** · 03-07-2009, 04:25 PM

For my caldina 3sgte I've used the 3y bellhousing and I've tried the stock 3y backing plate. There is still the issue of the 4th bolt hole not lining up with the block and it is thicker than the 1mm one that was used in the fwd setup. It also fouls the lower aluminium sump bit on the gen 3 onwards 3sge/3sgte motors but if you are using a 2s sump and pickup you probably will be ok.

I ended up making a new backing plate out of 1mm sheet steel. Its not too hard but the downside to this is that you loose the hole for the starter as this is used to locate it the right distance from the ring gear of the flywheel.

For the starter I'm still working on that but I have tried a 4age 100kw , 2sc one, 4afe, & 3y starter. None of these will bolt up. I am using a sw20 gen 3 3sgte flywheel which I believe is a larger diameter that the 3y so probably why I'm having issues when trying the 3y starter. Then there is the issue of spacing the starter away from the flywheel so that the gear engages in the right spot. To my knowledge other people have all had to either modify a starter to get it to fit by spacing and also rotating it so that there is clearance for the steering column. As you would have a LHD car then the rotating should not be an issue.

So I am basically looking at modifying one of the starters to fit my application by using one of the bolt holes and then chopping off the other bolt hole ear and welding on a new piece of aluminium which I will then drill and tap in the right spot so that the starter is in the right spot.

From a size point of view the 4age, 2sc and 3y starters all are the same size/design with the only major diff being the top part as it has different bolt hole ears to fit the different bellhousings. The 4afe starter is smaller than these and is newer but the actual motor is only 1kw whereas the others are 1.4kw. I am not sure if the lower motor speed will make a huge difference to the starting but the 1jz appears to use the same style of starter motor as the 4afe. It is a higher kw though.

So not too much help but to my knowledge there is not direct bolt up solution to this unless you want to use a gen 1 3sgte which has the 6 bolt flywheel so the 3y flywheel, bellhousing, starter combo should work. I haven't tried this but I know that the 2s flywheel, bellhousing, starter can all be used on the gen 1 3sgte so I would expect that the 3y gear would also work. The gen 2 3sgte went to 8 bolt. You appear to be moding a 3sge not a 3sgte so the gen 2/3 3sge may be 6 bolt cranks but I doubt it.

**assassin10000** · 03-07-2009, 06:06 PM

I think your 3sgte larger flywheel is causing interference. IIRC the starter for that comes in through the transmission side to allow more room. I don't think there is a starter that will work coming from the engine side without a lot more modification to the bellhousing.

On the 3y backing plate, no luck at all using it? Or did it just need modification for that one hole as well? And maybe cutting the bottom off so it doesn't foul the sump...

Andrew

**assassin10000** · 07-07-2009, 06:59 AM

Anyone else?

Andrew

**Celica RA45** · 07-07-2009, 04:54 PM

what i did was use a 3s and a 21r bellhousing and cut and rewelded starter on to inlet side and also same with the clutch master cyl have been running this set up for years and i also made up back ing plate s for it to bolt up as well

**assassin10000** · 29-09-2009, 02:49 AM

Back up.

Well, after a couple months of searching I was able to aquire a 3y bellhousing. So now it's down to starter/flywheel/clutch selection. I do have the stock dual mass flywheel from a BT 3sg, and it's teeth are significantly larger than a 4a flywheel's so that leaves out a bunch of options.

Anyone with this combo have any info on what to source a starter from?

Andrew