Timing Belt help: - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 09-20-2007, 01:55 AM   #1
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default Timing Belt help:

Back when I did the belt on my car we got it first try 100%. The last five miatas I've done have been a total pain in my ***, and the very last one took us six times to get the belt right (well... we thought the belt was off because the car was supercharged and didn't have any power.. come to find out the supercharger belt was slipping almost full time...)

The damned motor is on a stand and I'm still having a hard time getting it set correctly.

I've read the stupid book like eight times and its not helping. Read the howto on miata.net seven or eight times.. Still no help.

Basically can someone give me a few pointers? Should the indexing marks on the cam cogs be at dead 12 o-clock along with the crankshaft indexing mark?? I know those stupid "I" and "E" marks on the wheels that align with the backing plate aren't supposed to be lined up dead even..

Also.. can someone give me an accurate count of the number of teeth which are supposed to be between the 12 o'clock index markings on the cams? One guy has told me 19, another 21...
elesjuan is offline   Reply With Quote
Old 09-20-2007, 02:22 AM   #2
Elite Member
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 8,797
Total Cats: 248
Default

Those marks that allign on the backplate are the ones that matter. Get those correct. When their correct the other marks will point generally up, but not perfect. If it helps, put a cressent wrentch on each cam and clamp the two wrenches together with a c-clamp. Then the cam timming will stay correct while you get the belt on and check everything.
patsmx5 is offline   Reply With Quote
Old 09-20-2007, 03:04 AM   #3
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

Okay, so line the E and I marks with the backplate perfectly, them clamp them? Thats correct?
elesjuan is offline   Reply With Quote
Old 09-20-2007, 03:07 AM   #4
Elite Member
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 8,797
Total Cats: 248
Default

100% Correct. That's the easy way. Note, Once you get it right, if you ever had to pull the belt again, you can clamp the cams and they won't move, making it easier to reinstall the belt.
patsmx5 is offline   Reply With Quote
Old 09-20-2007, 03:55 AM   #5
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

I never thought of clamping two wrenches together holding the cams in place before.. saw that on miata.net, gonna use that for sure!!

Thanks. Hopefully we can get this right. Once I get the motor in the car it'll be HELL trying to adjust the bolt on the tensioner for the belt... Had to do something I really didn't want to. :(

Come to find out theres a difference between the FWD and RWD *BLOCK* nobody has mentioned yet that I've found online.. On FWD application they used a different alternator mount than the RWD. RWD has an ear on the water pump that FWD does not have. Also on the water pump FWD timing tensioner bolts to the pump, on the RWD the tensioner bolts to the block. So, using a RWD pump on FWD block. . . Yeah. So I stuck a nut behind the water pump to fix the problem. Once I get timing set its not going to be a problem. This motor is only a long term temp anyway.
elesjuan is offline   Reply With Quote
Old 09-20-2007, 09:27 AM   #6
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

I think you will find that the water pump "Ear" is 1.6 vs. 1.8
olderguy is offline   Reply With Quote
Old 09-20-2007, 09:45 AM   #7
Elite Member
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

I've mentioned that a number of times... I dealt with it on my escort engine install.

19 teeth between the marks.
Arkmage is offline   Reply With Quote
Old 09-20-2007, 10:52 AM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

clamping the cams never works for me. put the Exhaust cam into postion, the valve will kump into place right where it needs to go. turn the intake side to where it needs to go, it will pop into place about 2-4 teeth clockwise past the spot.

get the crank to tdc and proceede to wrap the timing belt onto the exhaust side first.

get the passenger off the tensior so the teeth will rest on the outside edge of it.

get a 14mm wrench and turn the intake pulley back counter-clockwise and finsih putting the belt over. verify the cam marks are still correct.

pull the belt back over the tensioner into the correct position. loosen the 14mm bolt to add a bit of tension on the belt. turn the crank untill the cams go back to the marks and make sure they still line up. if they do you're golden.

there will always be 19 teeth between the two vertical marks when the cams are lined up.
Braineack is offline   Reply With Quote
Old 09-20-2007, 11:54 AM   #9
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

I just looked, and made sure everything was tdc. I don't understand what's so difficult. Maybe I've just been lucky.
hustler is offline   Reply With Quote
Old 09-20-2007, 02:01 PM   #10
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

Quote:
Originally Posted by olderguy View Post
I think you will find that the water pump "Ear" is 1.6 vs. 1.8
Well if thats the case someone put the wrong water pump on the escort engine to begin with..



Attached to the engine in that photo is the miata pump I pulled off my blown up engine, foreground is the escort pump that was attached to the 1.8 when I removed it from the junk yard.
elesjuan is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
NA Seat Sliders and Seat Belt Receivers skipstr Miata parts for sale/trade 2 09-28-2015 11:53 PM


Thread Tools

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 04:58 PM.