Mating engine to transmission: bell housing and drive shaft alignment - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 03-18-2010, 06:51 AM   #1
Elite AbsurdFlow Member
Thread Starter
 
Laur3ns's Avatar
 
Join Date: Mar 2008
Location: Enschede, NL
Posts: 2,058
Total Cats: 11
Default Mating engine to transmission: bell housing and drive shaft alignment

So, quick question:

I've got the engine in the bay, all lined up to the transmission.

Now, the engine and bell housing are about 0.5" short of touching and I've got a couple of bolts (all around) in their holes.

Should I just slowly tighten them all up or MUST I push the engine fully agains the transmission before putting bolts in?

I think the bolts will all go in without too much effort.

Tell me!
Laur3ns is offline   Reply With Quote
Old 03-18-2010, 07:06 AM   #2
Elite Member
 
Join Date: Dec 2008
Location: Colorado
Posts: 1,669
Total Cats: 36
Default

You can tighten the bolts slowly to get them mated as long as they are not cross-threaded and everything is lined up. You are sure the input shaft splines are properly in the clutch disk splines?

Personally I always try to get them together as much as possible then tighten the bolts to make sure I dont mess it up. Often I find that I get about .5" apart and then tighten the bolts just like you are describing.
Sparetire is offline   Reply With Quote
Old 03-18-2010, 07:12 AM   #3
Elite AbsurdFlow Member
Thread Starter
 
Laur3ns's Avatar
 
Join Date: Mar 2008
Location: Enschede, NL
Posts: 2,058
Total Cats: 11
Default

Quote:
Originally Posted by Sparetire View Post
Personally I always try to get them together as much as possible then tighten the bolts to make sure I dont mess it up. Often I find that I get about .5" apart and then tighten the bolts just like you are describing.
Ok, so I'm good. Bolts are not X-threaded, they go in by hand for the first major part, so alignment must be okay. I will put shifter in 3rd and see if I can spin the diff.
Laur3ns is offline   Reply With Quote
Old 03-18-2010, 07:18 AM   #4
Elite Member
 
Join Date: Dec 2008
Location: Colorado
Posts: 1,669
Total Cats: 36
Default

Cool. The great thing about the traditional manual is that it either goes on or doesnt. No way to get it on incorrectly unless you snap a bolt or something.
Sparetire is offline   Reply With Quote
Old 03-18-2010, 07:23 AM   #5
Elite AbsurdFlow Member
Thread Starter
 
Laur3ns's Avatar
 
Join Date: Mar 2008
Location: Enschede, NL
Posts: 2,058
Total Cats: 11
Default

Quote:
Originally Posted by Sparetire View Post
Cool. The great thing about the traditional manual is that it either goes on or doesnt. No way to get it on incorrectly unless you snap a bolt or something.
I was sort of worried that I may crash the bearing inside the clutch/crank.
Laur3ns is offline   Reply With Quote
Old 03-18-2010, 07:31 AM   #6
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,370
Total Cats: 1,332
Default

Just go evenly. It never goes together particularly nice, but eventually it will go together. Throw it in gear and spin the diff occasionally like you were going to as you tighten everything down.
Savington is offline   Reply With Quote
Old 03-18-2010, 08:16 AM   #7
Elite Member
iTrader: (3)
 
Mach929's Avatar
 
Join Date: Oct 2004
Location: lansdale PA
Posts: 2,500
Total Cats: 0
Default

i had a hell of a time with mine. what i ended up doing was turning the engine over by hand and figured if the driveshaft was turning i was good to go. went around and tightened the bolts a little at a time. been fine for years since.
Mach929 is offline   Reply With Quote
Old 03-18-2010, 09:02 AM   #8
Elite Member
iTrader: (24)
 
Join Date: Jul 2007
Location: Cypress, TX
Posts: 3,778
Total Cats: 35
Default

I've gone through this twice now. One time, the throwout bearing failed to seat properly, causing the clutch pedal to work in reverse of normal operation (explain that). Last weekend, I realized the 1.6 thermostat housing on the back of the head was hitting the firewall.

Other than that, they've mated smoothly many times. I'm in agreeance with everyone else, as long as it's straight and the driveshaft spins with it in gear, you're good to go.
Bryce is offline   Reply With Quote
Old 03-18-2010, 09:06 AM   #9
Elite Member
iTrader: (5)
 
Join Date: Apr 2007
Location: Wellford, SC
Posts: 1,704
Total Cats: 1
Default

I had this same thing happen to me when replacing a throwout bearing... Just wiggle it around and it should seat properly. Or you can do what we did and pull it back off and try again. On the second attempt, it slide right into place almost instantly. Our guess was that it was in a bind when being placed on the engine. Good luck.
thagr81 us is offline   Reply With Quote
Old 03-18-2010, 09:15 AM   #10
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

shake it like when your pissed at your wife...it'll mate.
Braineack is offline   Reply With Quote
Old 03-18-2010, 09:36 AM   #11
meatbag
iTrader: (50)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Houston, TX
Posts: 7,357
Total Cats: 26
Default

Quote:
Originally Posted by Braineack View Post
shake it like when your pissed at your wife...it'll mate.
This



I've always had it completely flush before I started tightening. It should sit fine on the dowels if everything's straight.

The only time it gave me a problem I hadn't aligned the clutch properly before tightening down...fought it for an hour. Borrowed a real alignment tool, and it slipped right in.
gospeed81 is offline   Reply With Quote
Old 03-18-2010, 10:03 AM   #12
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,109
Total Cats: 518
Default

This is the main reason I wouldn't want to pull the engine with the transmission still in the car, you'd have to fight the thing while laying under it.
curly is online now   Reply With Quote
Old 03-18-2010, 10:06 AM   #13
meatbag
iTrader: (50)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Houston, TX
Posts: 7,357
Total Cats: 26
Default

^^^ Yes.

Last time I did it, with the motor swap, it took 2min to mate up, as it was hanging from the hoist.
gospeed81 is offline   Reply With Quote
Old 03-18-2010, 10:20 AM   #14
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

Quote:
Originally Posted by curly View Post
This is the main reason I wouldn't want to pull the engine with the transmission still in the car, you'd have to fight the thing while laying under it.
no joke that was the biggest mistake i've ever made, ever.
Braineack is offline   Reply With Quote
Old 03-18-2010, 10:21 AM   #15
meatbag
iTrader: (50)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Houston, TX
Posts: 7,357
Total Cats: 26
Default

Quote:
Originally Posted by Braineack View Post
no joke that was the biggest mistake i've ever made, ever.
I'd put it at a close second behind getting married.
gospeed81 is offline   Reply With Quote
Old 03-18-2010, 07:22 PM   #16
Elite AbsurdFlow Member
Thread Starter
 
Laur3ns's Avatar
 
Join Date: Mar 2008
Location: Enschede, NL
Posts: 2,058
Total Cats: 11
Default

Quote:
Originally Posted by Braineack View Post
shake it like when your pissed at your wife...it'll mate.
Grammar fail. And this, from you?

BTW, shortly after post #8 I went on it. Trans in gear and all was good, tightened all bolts and all is well.

Keenonracing | Facebook
Laur3ns is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Garrett Turbo, 1.8 Oil Pan, & Misc. Stuff nbdooey Miata parts for sale/trade 9 08-30-2017 10:50 PM
15x10 - 15x11 6UL @ 949 Racing emilio700 Wheels and Tires 151 06-02-2017 03:36 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:40 PM.