Am I going crazy? When I point the two timing gear dots at each other it's NOT tdc!
#16
CF Veteran
Join Date: May 2015
Location: Arizona
Posts: 4,481
Likes: 0
Received 18 Likes
on
14 Posts
Year: 97
Model: Cherokee
Engine: 4.0
Lined up after they are installed on the engine and compensated for the droop against the rubbing block on the top? or lined up before you put them on? important difference here because once you put them on, it changes about a tooth in alignment.
#17
CF Veteran
Join Date: Aug 2010
Location: Canton, MI
Posts: 8,357
Likes: 0
Received 90 Likes
on
74 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
The cam and crank gears/sprockets are keyed. You turn the crank so #1 piston is dead nuts at the top of its travel. Position the cam so the key slot is about where yo need it. Assemble the cam, crank, and chain together (sorta) so the dots on the two sprockets face each other. Assemble the group so the crank sprocket fits in its key while moving the cam in to position so its sprocket fits it key. Both sprocket dots should be facing each other.
Refer to Section 9 of your FSM for the factory instructions for installation instructions.
#18
CF Veteran
Join Date: May 2015
Location: Arizona
Posts: 4,481
Likes: 0
Received 18 Likes
on
14 Posts
Year: 97
Model: Cherokee
Engine: 4.0
The cam and crank gears/sprockets are keyed. You turn the crank so #1 piston is dead nuts at the top of its travel. Position the cam so the key slot is about where yo need it. Assemble the cam, crank, and chain together (sorta) so the dots on the two sprockets face each other. Assemble the group so the crank sprocket fits in its key while moving the cam in to position so its sprocket fits it key. Both sprocket dots should be facing each other.
Refer to Section 9 of your FSM for the factory instructions for installation instructions.
Refer to Section 9 of your FSM for the factory instructions for installation instructions.
Thank you for this detailed clarification because I had to do mine twice due to this difference and I'm still not sure it is right. It runs FANTASTIC but no matter what I do with everything else I am still getting a Chrysler specific code for valve timing issues.
MAP maybe? Can the MAP sensor affect this reading and code? It is for sure not the distributor, I know for sure I got that right per your great info about the alignment hole. It just runs too good...as if it was indexed to get the best out of a racing cam.
But I am getting that code and CEL...
#19
CF Veteran
Join Date: Aug 2010
Location: Canton, MI
Posts: 8,357
Likes: 0
Received 90 Likes
on
74 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Thank you for this detailed clarification because I had to do mine twice due to this difference and I'm still not sure it is right. It runs FANTASTIC but no matter what I do with everything else I am still getting a Chrysler specific code for valve timing issues.
MAP maybe? Can the MAP sensor affect this reading and code? It is for sure not the distributor, I know for sure I got that right per your great info about the alignment hole. It just runs too good...as if it was indexed to get the best out of a racing cam.
But I am getting that code and CEL...
MAP maybe? Can the MAP sensor affect this reading and code? It is for sure not the distributor, I know for sure I got that right per your great info about the alignment hole. It just runs too good...as if it was indexed to get the best out of a racing cam.
But I am getting that code and CEL...
What code?
#21
Junior Member
Thread Starter
Join Date: Jul 2012
Posts: 43
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1992
Model: Cherokee
Engine: 4.0l I6
The cam and crank gears/sprockets are keyed. You turn the crank so #1 piston is dead nuts at the top of its travel. Position the cam so the key slot is about where yo need it. Assemble the cam, crank, and chain together (sorta) so the dots on the two sprockets face each other. Assemble the group so the crank sprocket fits in its key while moving the cam in to position so its sprocket fits it key. Both sprocket dots should be facing each other.
Refer to Section 9 of your FSM for the factory instructions for installation instructions.
Refer to Section 9 of your FSM for the factory instructions for installation instructions.
It still wont start though. I tested the coil wire with a spark tester and it's not sparking correctly. The coil output is supposed to give a constant steady spark like... [*-*-*-*-*-*-*-*-*-*-*-*-*-] while cranking. But mine is sparking like this... [*-*--------*-*---------*-*---------] Almost like it's it's only sparking twice per engine revolution when it should be sparking six times per engine revolution. Why the hell would the ecu tell it to do that? I've put two brand new crank sensors on it, that seems to be reading perfectly. The cam position sensor pulses fine too. I just don't get it.
Last edited by Zerocyde; 11-08-2015 at 01:50 PM.
#22
That's what I did. Just seems odd that when the two dots facing each other it's actually at TDC exhaust stroke. So I have to install the chain with the two dots facing each other, then rotate the engine 180 so it's TDC compression stroke and then point the dizzy at the #1 wire.
You can determine TDC compression stroke when you see BOTH valves closed (both rockers up) on #1.
#23
Member
Join Date: Dec 2014
Location: Katy, TX
Posts: 148
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Cherokee
Engine: 4.0
^^^^^^ What he said... Find TDC on compression and check to see if the rotor points at #1. That is how I have always done it. You can draw a mark on the distributor under #1 so it will be clearly marked when you remove the cap. If the #1 cylinder is at TDC on compression stroke and the rotor is pointed at the #1 plug wire you are good.
Thread
Thread Starter
Forum
Replies
Last Post
LuvMyXJ44
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
5
10-31-2015 09:54 PM
02809bristol
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
10-25-2015 12:16 AM
Jillayne
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
2
10-19-2015 02:16 PM
Iain_Jeep_UK
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
0
10-17-2015 06:53 AM
jvanbree
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
10-15-2015 05:25 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)