how dead nuts is "top dead center"
#1
Thread Starter
Junior Member
Joined: Aug 2011
Posts: 39
Likes: 0
From: North Georgia
Year: 1988
Model: Cherokee
Engine: 4.0
how dead nuts is "top dead center"
got spark and fuel, crank, no start...
Double checking my timing and when i put #1 cyl at , what looks to me, top dead center, my rotor button seems to be past 1, more between 1 AND 5 post.
When i rotate engine so rotor button is at 1 post, it seems that my piston is slightly lower then top.
How dead nuts does this need to be? Am i over thinking this?
Double checking my timing and when i put #1 cyl at , what looks to me, top dead center, my rotor button seems to be past 1, more between 1 AND 5 post.
When i rotate engine so rotor button is at 1 post, it seems that my piston is slightly lower then top.
How dead nuts does this need to be? Am i over thinking this?
#2
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,566
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
If you're trying to index your distributor, it's very important. You really need a sacrificial dizzy cap to do this right. You cut a window into the cap so you can see the #1 terminal in the cap. The rotor's trailing edge should be .020" past the #1 terminal at TDC.
#4
Seasoned Member
Joined: Jun 2011
Posts: 287
Likes: 1
From: Catasauqua PA
Year: 1996
Model: Cherokee
Engine: 4.0
Originally Posted by DEOR
great thanks for the info,
can you go into indexing the distributor a bit more.
setting timing is new territory for me.
can you go into indexing the distributor a bit more.
setting timing is new territory for me.
#6
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,566
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
There should be alignment holes in the distributor. 2 that you can see when you take the coil off, and 1 underneath. Spin it so the 2nd hole on the top aligns with the hole underneath and drop a pin in it to hold it there. Turn the oil pump drive to 11 o'clock, put the motor TDC and it should drop right in and be perfectly lined up.
To the OP: My post #2 is how you index the distributor on a Renix. It has nothing to do with your ignition timing.
#7
Senior Member
Joined: Jul 2011
Posts: 598
Likes: 1
From: Wilmington, NC
Year: 1997
Model: Cherokee
Engine: 4.0L
OP - as cruiser just stated - when you are at TDC the rotor should be slightly PAST the #1 post. If it fired right when you reach TDC it would be too late - hence the purpose of timing advance.
The teeth on the distributor (at least on an HO) are pretty big and being a tooth off is pretty obvious.
Trending Topics
#8
Seasoned Member
Joined: Jun 2011
Posts: 287
Likes: 1
From: Catasauqua PA
Year: 1996
Model: Cherokee
Engine: 4.0
Originally Posted by cruiser54
Good info for 91 and later but irrelevant for a Renix.
To the OP: My post #2 is how you index the distributor on a Renix. It has nothing to do with your ignition timing.
#11
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,566
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Yes
OP - as cruiser just stated - when you are at TDC the rotor should be slightly PAST the #1 post. If it fired right when you reach TDC it would be too late - hence the purpose of timing advance.
The teeth on the distributor (at least on an HO) are pretty big and being a tooth off is pretty obvious.
OP - as cruiser just stated - when you are at TDC the rotor should be slightly PAST the #1 post. If it fired right when you reach TDC it would be too late - hence the purpose of timing advance.
The teeth on the distributor (at least on an HO) are pretty big and being a tooth off is pretty obvious.
Thread
Thread Starter
Forum
Replies
Last Post
jpmarine6786
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
43
10-22-2023 05:16 AM
SergeK
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
8
02-27-2023 04:38 PM
Austindude2015
Cherokee Chat
17
12-28-2020 06:12 PM
CJG
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
09-28-2015 04:46 PM
Snajo
Other Vehicles. Other Jeep models & cars and trucks of other makes
0
09-27-2015 12:54 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)