tylergrant2011 Posted January 5, 2016 Share Posted January 5, 2016 Has anyone ever heard of the block having a hairline cracked just above the center freeze plug on the driver side. My 87 jeep has started to run hot and you can see a little drip of water coming out slowly just above the freezer plug. Any suggestions? Link to comment Share on other sites More sharing options...
cruiser54 Posted January 5, 2016 Share Posted January 5, 2016 Yes, I have seen it and that's right where they crack. Link to comment Share on other sites More sharing options...
tylergrant2011 Posted January 5, 2016 Author Share Posted January 5, 2016 What year model engines are compatible with a 87' comanche 4.0 2wd? Link to comment Share on other sites More sharing options...
gogmorgo Posted January 5, 2016 Share Posted January 5, 2016 Any 4.0 out of an MJ, XJ, YJ, or ZJ (but not the 4.0 from the WJ or TJ) will bolt in, but it'll be less work to use an '87 to '90. Cruiser's got a tip for the HO ('91-'95) into a Renix. OBD2 ('96+) gets more complex. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted January 5, 2016 Share Posted January 5, 2016 The actual long block from any '87-01 XJ's ('00-01 being not so desirable for a few reasons), any '93-98 ZJ's, '87-92 MJ's, and which ever YJ's had the 4.0 will be compatible. You can swap over everything from your Renix engine including the intake manifold, or, if you desire to keep the HO intake manifold, you can swap the sensors over from your Renix intake mani and the only hard part is adapting the Renix TPS to the HO throttle body. Even that isn't terrible, and if you want to go for easy, Hesco makes a sweet adapter for just this. Or, you can DIY: http://www.naxja.org/forum/showthread.php?t=1100996 17. HO engine into Renix This swap is easier than some will lead you to believe, generally those who have never done it. Those of us who have done it, like myself, will share with you the things that need to be done for a successful swap. Just think of it as swapping in a long block. The HO and Renix have some differences but none that can’t be overcome very easily.Any HO engine from an XJ or ZJ through 1999 can be used. One running change was that the rear of the head was no longer drilled and tapped for the temperature gauge sender beginning in the 96 model year. The sender can be relocated to the threaded hole in the thermostat housing taken from the HO engine. You’ll have to extend the wire to that location. Some brave souls even drill and tap the HO head for the sender. You will be using the intake and exhaust manifolds from your Renix, along with all your sensors and wiring. Since the intake ports of the HO are slightly different, you use the Renix gasket. Exhaust ports are identical. You will need to use your Renix distributor as it is different than the HO because they use different fuel management systems. The flywheel or flexplate from the Renix must be used so your CPS gets the correct signals. The valve cover from the Renix allows you to keep your CCV system intact and requires no modifications. The HO block will have a plug in the coolant galley on the driver’s side of the block, closest to the front, which needs to be removed so your Coolant Temp Sensor can be installed in it’s place just as it is on the Renix. It requires a 5/16" square drive or a modified 3/8" drive that has been ground down to fit. Do this before installing the engine. As for the knock sensor, which is located just above the oil pan on the driver’s side of the engine about mid way, all the blocks I’ve seen are threaded for it. If not, I’ve heard they may be drilled but not tapped. Tap the hole if that’s the case. Revised 03/28/13 Link to comment Share on other sites More sharing options...
tylergrant2011 Posted January 5, 2016 Author Share Posted January 5, 2016 If HO was installed in would have to use the manifolds and gaskets and sensors from my remix correct? Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted January 5, 2016 Share Posted January 5, 2016 If HO was installed in would have to use the manifolds and gaskets and sensors from my Renix correct? See post above. Link to comment Share on other sites More sharing options...
tylergrant2011 Posted January 5, 2016 Author Share Posted January 5, 2016 I appreciate it guys sounds like it's not too bad of a task the only thing I'm experiencing now is a bolt on the top of the bell housing it has some star shape to it and I don't have nothing to fit it Link to comment Share on other sites More sharing options...
88whitemanche Posted January 5, 2016 Share Posted January 5, 2016 You need an E12 socket for the top 2 bolts Link to comment Share on other sites More sharing options...
88whitemanche Posted January 5, 2016 Share Posted January 5, 2016 They should have a small set at autozone or advance or even Napa if they are close to you... I got mine at harbor freight Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted January 5, 2016 Share Posted January 5, 2016 ^This. And once you get those inverted torx bolts out, replace them with as standard hex head, Grade 8 bolt, with a washer. It's a 3/8-16x1.75" Hillman P/N: 43191. Link to comment Share on other sites More sharing options...
tylergrant2011 Posted January 5, 2016 Author Share Posted January 5, 2016 Can I replace those top two bolts for standard bolts as soon as I remove them and install the new engine Link to comment Share on other sites More sharing options...
cruiser54 Posted January 5, 2016 Share Posted January 5, 2016 If HO was installed in would have to use the manifolds and gaskets and sensors from my remix correct? Read this: Cruiser’s HO into Renix Swap This swap is easier than some will lead you to believe, generally those who have never done it. Those of us who have done it, like myself, will share with you the things that need to be done for a successful swap. Just think of it as swapping in a long block. The HO and Renix have some differences but none that can’t be overcome very easily. Any HO engine from an XJ or ZJ through 1999 can be used. One running change was that the rear of the head was no longer drilled and tapped for the temperature gauge sender beginning in the 96 model year. The sender can be relocated to the threaded hole in the thermostat housing taken from the HO engine. You’ll have to extend the wire to that location. Some brave souls even drill and tap the HO head for the sender. You will be using the intake and exhaust manifolds from your Renix, along with all your sensors and wiring. Since the intake ports of the HO are slightly different, you use the Renix gasket. Exhaust ports are identical. You will need to use your Renix distributor as it is different than the HO because they use different fuel management systems. The flywheel or flexplate from the Renix must be used so your CPS gets the correct signals. The valve cover from the Renix allows you to keep your CCV system intact and requires no modifications. The HO block will have a plug in the coolant galley on the driver’s side of the block, closest to the front, which needs to be removed so your Coolant Temp Sensor can be installed in it’s place just as it is on the Renix. It requires a 5/16” square drive or a modified 3/8” drive that has been ground down to fit. Do this before installing the engine. As for the knock sensor, which is located just above the oil pan on the driver’s side of the engine about mid way, all the blocks I’ve seen are threaded for it. If not, I’ve heard they may be drilled but not tapped. Tap the hole if that’s the case. Revised 03/28/13 Link to comment Share on other sites More sharing options...
cruiser54 Posted January 5, 2016 Share Posted January 5, 2016 Any 4.0 out of an MJ, XJ, YJ, or ZJ (but not the 4.0 from the WJ or TJ) will bolt in, but it'll be less work to use an '87 to '90. Cruiser's got a tip for the HO ('91-'95) into a Renix. OBD2 ('96+) gets more complex. Works all the way through 99 actually. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted January 6, 2016 Share Posted January 6, 2016 ... :doh: Can I replace those top two bolts for standard bolts as soon as I remove them and install the new engine ^This.And once you get those inverted torx bolts out, replace them with as standard hex head, Grade 8 bolt, with a washer. It's a 3/8-16x1.75" Hillman P/N: 43191. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 6, 2016 Share Posted January 6, 2016 Can I replace those top two bolts for standard bolts as soon as I remove them and install the new engine You need to slow down asking questions and read the advice given to you. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted January 6, 2016 Share Posted January 6, 2016 You need to slow down asking questions and read the advice given to you. Thank you, glad someone else was thinking it. :cheers: Link to comment Share on other sites More sharing options...
tylergrant2011 Posted January 6, 2016 Author Share Posted January 6, 2016 My bad lol. I was on the forum on my phone and the above post wasnt showing up for some reason. Last question can any of yall post a link for the instrument panel cluster swap from the dummy lights to actual gauges. I read about it on this forum once but misplaced it. Link to comment Share on other sites More sharing options...
buckwheat Posted January 6, 2016 Share Posted January 6, 2016 http://www.naxja.org/forum/showthread.php?t=921205 Link to comment Share on other sites More sharing options...
tylergrant2011 Posted January 6, 2016 Author Share Posted January 6, 2016 Thanks Link to comment Share on other sites More sharing options...
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