tylergrant2011 Posted February 9, 2015 Share Posted February 9, 2015 Ok I have a 87 comanche 4.0 that jumped time. I sat it to tdc and aligned the cam pin with crank pin. Took out distributor and adjusted rotor to number one plug. It backfires when trying to start . Any suggestions.? Does timing marks suppose to line up on these motors. Link to comment Share on other sites More sharing options...
Jeep Driver Posted February 9, 2015 Share Posted February 9, 2015 Distributor is 180 degrees off. Link to comment Share on other sites More sharing options...
tylergrant2011 Posted February 9, 2015 Author Share Posted February 9, 2015 So if I align at tdc. How can I get my cam to align right with it Link to comment Share on other sites More sharing options...
Jeep Driver Posted February 9, 2015 Share Posted February 9, 2015 http://comancheclub.com/topic/36382-cruisers-renix-tips/ Study #13 Link to comment Share on other sites More sharing options...
nitroxsteve Posted February 9, 2015 Share Posted February 9, 2015 Did you replace the timing chain? Link to comment Share on other sites More sharing options...
Eagle Posted February 9, 2015 Share Posted February 9, 2015 So if I align at tdc. How can I get my cam to align right with it It has to be at TDC with the #1 cylinder on the compression stroke. You may have it on the exhaust stroke. Then you count the number of links between the mark on the crank sprocket and the mark on the cam sprocket. How to set that is in the FSM. Link to comment Share on other sites More sharing options...
tylergrant2011 Posted February 10, 2015 Author Share Posted February 10, 2015 Yes I got a new timing chain and sprockets I set #1 cylinder to tdc on compression stroke. I aligned my camshaft with the dot on the crank. My distributor rotor was pointing to #6 I believe. Before all this happened the truck jumped time and I didnt know it I took the whole distributor out and now I'm let where I'm at now. New distributor new timing chain and sprockets new rotor new cap new plugs new wires. But I can't get the dang thing to fire right when I manual set the distributor to number one and line all marks up. Link to comment Share on other sites More sharing options...
Jeep Driver Posted February 10, 2015 Share Posted February 10, 2015 Yes I got a new timing chain and sprockets I set #1 cylinder to tdc on compression stroke. I aligned my camshaft with the dot on the crank. My distributor rotor was pointing to #6 I believe. Before all this happened the truck jumped time and I didnt know it I took the whole distributor out and now I'm let where I'm at now. New distributor new timing chain and sprockets new rotor new cap new plugs new wires. But I can't get the dang thing to fire right when I manual set the distributor to number one and line all marks up. Bringing #1 piston to TDC does NOT mean you are on the compression stroke, the cam determines the compression or exhaust stroke. What makes you think you 'jumped time'? Link to comment Share on other sites More sharing options...
tylergrant2011 Posted February 10, 2015 Author Share Posted February 10, 2015 Was 3 pins off when pulled cover because it randomly quit while going uphill oneday. You know about where the cam mark needs to be on this? I thought it was supposes to be at the notch right before exaust valve on#1 Link to comment Share on other sites More sharing options...
Jeep Driver Posted February 10, 2015 Share Posted February 10, 2015 Image Not Found There should be a mark on the cam gear and on the crank gear and the marks line up together. If you drew a line directly through the center of the cam and crank, the marks would be on the line. Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 10, 2015 Share Posted February 10, 2015 Check crank and cam gear alignment on your 4.0 as below, Then index the distributor using this procedure. Check your distributor wiring order twice. http://www.angelfire.com/my/fan/dist_index.html Link to comment Share on other sites More sharing options...
tylergrant2011 Posted February 10, 2015 Author Share Posted February 10, 2015 Ok they are lined perfect but my distributor rotor is pointing around the num ber 6 Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 10, 2015 Share Posted February 10, 2015 Looks like you are 180* out then. Link to comment Share on other sites More sharing options...
Eagle Posted February 10, 2015 Share Posted February 10, 2015 Yes I got a new timing chain and sprockets I set #1 cylinder to tdc on compression stroke. I aligned my camshaft with the dot on the crank. My distributor rotor was pointing to #6 I believe. Before all this happened the truck jumped time and I didnt know it I took the whole distributor out and now I'm let where I'm at now. New distributor new timing chain and sprockets new rotor new cap new plugs new wires. But I can't get the dang thing to fire right when I manual set the distributor to number one and line all marks up. As pointed out by Jeep Driver, being at TDC does not mean you are on the compression stroke. In fact, if your distributor was pointing at #6 with the piston at TDC, I'd guess you are on the exhaust stroke. The firing order for an in-line 6 is 1-5-3-6-2-4. Notice that #6 corresponds to #1, but on the second go-round for the crank in one full cycle (two revolutions). Either that, or you didn't index the new distributor properly when you installed it. The housing itself can't be adjusted (unless you follow Hornbrod's procedure and grind off the indexing tab, but that should be the LAST resort, not the first). If you're certain the #1 cylinder is at TDC and is on the compression stroke, then you'll need to pull the distributor and realign the drive gear by a couple of teeth until it points at the #1 turret on the distributor cap. Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 10, 2015 Share Posted February 10, 2015 What "grinding"? No grinding necessary for a stock cam. Just pull the dizzy, rotate 180* according to the procedure, then see if it fires up. You should not need to cut the "ears" to correctly position the distributor unless you've installed an aftermarket camshaft. Link to comment Share on other sites More sharing options...
daking Posted February 10, 2015 Share Posted February 10, 2015 I literally just went through this. New engine. The distributor was not aligned. I pulled the distributor out. I put cyl 1 at TDC, and made sure crank was at 0*. I could not get the rotor to line up exactly with #1 on the cap. I kept moving the oil pump, and re seating, but it would always be just before or just after #1. Turned out it was 180 off. rotated engine till a puff of air came from the spark plug hole of #1 cyl, moved crank pulley to 0*, moved oil pump gear to 11 o-clock, and installed distributor. dropped right into place. dead on with #1 cyl on cap. centered. I have an aftermarket cam, no notching needed for my install. I did cut the cap, to see rotor, but later I discovered just painting a small white line on the distributor body where cyl1 is, was easier. Also marking the small "cut" on the crank pulley mae it really easy to see an align to 0*. Link to comment Share on other sites More sharing options...
tylergrant2011 Posted February 10, 2015 Author Share Posted February 10, 2015 I'm gonna try to index the dist. The only other thing I can think of is if they gave me the wrong sprockets. Link to comment Share on other sites More sharing options...
tylergrant2011 Posted February 11, 2015 Author Share Posted February 11, 2015 I'm an idiot I thought the exaust stroke was blowong out air in fact it was but not near as much as the second go around on compression. I was 180 off the whole time. Thanks guys and does anyone know where and the part numbers for all the vaccuum lines and pcv? All my plastic hoses arw brittle and the rubber ones are dry rotted. Link to comment Share on other sites More sharing options...
daking Posted February 11, 2015 Share Posted February 11, 2015 I'm an idiot I thought the exaust stroke was blowong out air in fact it was but not near as much as the second go around on compression. I was 180 off the whole time. Thanks guys and does anyone know where and the part numbers for all the vaccuum lines and pcv? All my plastic hoses arw brittle and the rubber ones are dry rotted. glad you got it fixed. On the hoses and vac lines, I was looking for that too. never found a complete set. I just pulled the hard lines from a pick n pull. And bought an assortment of vac lines at auto stores. Link to comment Share on other sites More sharing options...
ggcnash Posted February 11, 2015 Share Posted February 11, 2015 Here ya go http://www.hiperformancestore.com/jeep.htm Link to comment Share on other sites More sharing options...
tylergrant2011 Posted February 11, 2015 Author Share Posted February 11, 2015 Thanks guys I know before all this I had fire coming out of my throttle body I hope it didnt hurt anything Link to comment Share on other sites More sharing options...
HOrnbrod Posted February 11, 2015 Share Posted February 11, 2015 Should be no worries mate. I haven't done the 180* wrong insertion with the distributor (yet), but I've sure missed a tooth or three a few too many times. Happens to everyone, and it's not fatal. :cheers: Link to comment Share on other sites More sharing options...
tylergrant2011 Posted February 11, 2015 Author Share Posted February 11, 2015 Sad thing is ive worked on cars all my life but never put something in @$$ backwards like that Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now