| View previous topic :: View next topic |
| Author |
Message |
McGyver
Joined: 24 Feb 2009
Posts: 354
Location: Jelenia Gora - Poland
|
 Posted: Thu Aug 04, 2011 8:02 am Post subject: 931 engine with auto transmission - questions |
 |
|
I've got 924 with auto transmission and 931 engine  preaty interesting.
But unfortunatelly I can't test it becouse something is wrong... I can't turn the crank more than 1/4 full turn. Something block it... and the same in second direction. Cam shaft works fine - It could be turn 360 degrees without problems - I took out timing belt to change it and now I can't put new one becouse I can't turn it to marked "0" position. Pistons are moving maybe 0,5-1 inch... or something - don't know exactly.
It's 931 S1 engine - with 924 auto gearbox... It's my first auto-g. so I don't know anything about it.
I've got this car for spare parts, so I didn't test engine before... anything could be wrong connected or smth.
Any propositions what could be wrong? why I can't rotate the crankshaft.
_________________
931 82' - 5000km after full engine rebuild 
SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car
www.mauser98k.internetdsl.pl - if someone like german rifles (English version avalible) |
|
| Back to top |
|
 |
Grenadiers
Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ
|
| Posted: Thu Aug 04, 2011 9:06 am Post subject: |
|
|
Did you set the engine at TDC before removing old belt? It's a handy reference point for installing a new belt. Sometimes the cam might inexplicably turn 30 degrees or so to it's next position, if you try to rotate it by hand. I did this once.
Had to turn both crank and cam a bit at a time to get the valves out of the way. Whew. Disaster averted!
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke |
|
| Back to top |
|
|
Tas931
Joined: 08 Apr 2010
Posts: 142
Location: Tasmania, Australia
|
| Posted: Fri Aug 05, 2011 11:28 am Post subject: |
|
|
| I had similar fun... there was a mark on the front and back of my cam wheel which are in different spots.... i kept looking at the wrong mark going WTF it's in the right spot..... Untill it clicked when i saw the other side lol |
|
| Back to top |
|
|
McGyver
Joined: 24 Feb 2009
Posts: 354
Location: Jelenia Gora - Poland
|
| Posted: Sat Aug 06, 2011 2:06 am Post subject: |
|
|
I don't have problem how to set timing belt that's quite easy job. I get info from previous car owner and one bolt in bellhousing was loosed, and so it blocking crank. So If I find it and fix, I should be able to put timing belt again in place and check engine.
Anyone know is it possible to simply put auto trans to 931 engine? I got something like this here I curious because someone use 931 bellhousing I believe because starter motor is still under the car... I'm not sure the torque tube is the same for 931 and 924. PET shows 4 bolts on booth so maybe they're interchangeable. And should be possible to put 924 auto gearbox to 931 engine without any major modifications.
Anyone knows that for sure? I will dismantle that car for pieces in next few weeks but wanted to test it first running.
_________________
931 82' - 5000km after full engine rebuild
SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car
www.mauser98k.internetdsl.pl - if someone like german rifles (English version avalible) |
|
| Back to top |
|
|
RC
Joined: 25 Mar 2007
Posts: 2637
Location: Australia
|
| Posted: Sun Aug 07, 2011 7:43 pm Post subject: |
|
|
| McGyver wrote: | Anyone know is it possible to simply put auto trans to 931 engine? I got something like this here I curious because someone use 931 bellhousing I believe because starter motor is still under the car... I'm not sure the torque tube is the same for 931 and 924. PET shows 4 bolts on booth so maybe they're interchangeable. And should be possible to put 924 auto gearbox to 931 engine without any major modifications.
Anyone knows that for sure? I will dismantle that car for pieces in next few weeks but wanted to test it first running. |
TBH, no-one knows anything "for sure" about these cars even if they bought it brand new from the factory. 
It will be simple to bolt a whole AT drivetrain up to any engine with the same block, NA, 931/2. With a high stall converter and the stock turbo it wouldn`t be too slow either.
Prior to mentioning the 931 bell housing I would have thought along the lines of the other guys who in a gentle way suggested you most likely have bent valves by now. Unless the torque tube or converter is very severely rusted or seized (like drowned in salt water) the AT will impose little drag at all, just the TT bearing resistance and that of the TC vanes slowly moving through ATF. The TC is only coupled hydraulically, parking brake only locks output shaft drum. The dreaded rubber damper, by itself, will not prevent or limit full movement either.
However, with a 931 bellhousing , this car becomes a frankenbox of mystery. Anything is possible with a big enough hammer. Am kind of interested here as I have thought of using a 944 AT bellhousing and having the advantage of relocating the starter to the rear. Some basics: NA driveshaft for manual and auto is nominal 20mm. Stock 931 and 944 (AT & man) use 25mm shaft. Unsure of length but have both 924 and 944 ones to measure. The larger shaft will require the use of 944 damper and TC flange plate at rear. Possibly the damper or yoke/adapter is interfering with the 931 bellhousing but they appear to be thinner overall that a pressure plate assembly. You can see the shaft from under the car at the inspection plate hole and coupler hole at rear too.
IF your starter is really mounted rearward of the flywheel, how about some pictures.
Should not be difficult to establish how far down the bore the pistons are. Only need 1/2" or so to freely spin the cam without risk of valve contact.
_________________
World`s quickest 924 2L slushbox
| Allan @ DTA wrote: | | I have no issue with superchargers, they are for guys who want to drive a car rather than talk about horsepower with their baseball cap on backwards |
|
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
924 FAQ (Technical)
