KA24DE tensioners VS guides

Information on the naturally-aspirated KA24E and KA24DE engines.
pawndave
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Joined: Mon Feb 13, 2012 5:14 pm
Car: 1995 Nissan Altima 2.4 liter

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Ok, i am replacing my timing chain tensioners in a 95 Altima. Should i replace the guides as well. I ask because the tensioners do not come with the guides, but the timing chain kit comes with it all. Do the guides wear out? Also it says to compress the piston on the tensioners and put something in the hole to hold it in place. The guides wont budge, so i cant compress them. This shouldnt matter as im going to toss them anyways. Any tips on installing the new ones? Thanks.


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breadbox
Posts: 8550
Joined: Tue Oct 17, 2006 4:09 pm
Car: Red 89 240sx,Black 89 Koop, White 84 720 4x4KC
Location: Va Bch

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pawndave wrote:Ok, i am replacing my timing chain tensioners in a 95 Altima. Should i replace the guides as well. I ask because the tensioners do not come with the guides, but the timing chain kit comes with it all. Do the guides wear out? Also it says to compress the piston on the tensioners and put something in the hole to hold it in place. The guides wont budge, so i cant compress them. This shouldnt matter as im going to toss them anyways. Any tips on installing the new ones? Also, someone recommended using loctite on all of the new bolts, is this true? Do i need to torque all of the new bolts with a torque wrench? Or should i just use my judgement?

Should you replace the guides? Yes.
Do the guides wear out? Yes, after the guide breaks the chain slaps through the rest of it and its bolts and into a water jacket.

The compressing of the tensioner piston is just makes it easy to line up the new timing set. I use a push pin, push the piston into the housing and stick it in the little hole, you set the timing and then take out the pin, which releases the piston into the tensioner.

There should be no slack on the guide side, all slack has to be tensioner side. Hopefully your chain has two colored links and not just one like mine did.

Use non permanant threadlocker on the bolts, any vibrating bolts in the timings set will back out and fall on your lower sprocket and F everything up, guaranteed. only bolts you really need to torque right are the cam bolt and crank bolt, everything else should be "german torque spec" Gutenteit.

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breadbox
Posts: 8550
Joined: Tue Oct 17, 2006 4:09 pm
Car: Red 89 240sx,Black 89 Koop, White 84 720 4x4KC
Location: Va Bch

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pawndave
Posts: 15
Joined: Mon Feb 13, 2012 5:14 pm
Car: 1995 Nissan Altima 2.4 liter

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breadbox wrote:
pawndave wrote:Ok, i am replacing my timing chain tensioners in a 95 Altima. Should i replace the guides as well. I ask because the tensioners do not come with the guides, but the timing chain kit comes with it all. Do the guides wear out? Also it says to compress the piston on the tensioners and put something in the hole to hold it in place. The guides wont budge, so i cant compress them. This shouldnt matter as im going to toss them anyways. Any tips on installing the new ones? Also, someone recommended using loctite on all of the new bolts, is this true? Do i need to torque all of the new bolts with a torque wrench? Or should i just use my judgement?

Should you replace the guides? Yes.
Do the guides wear out? Yes, after the guide breaks the chain slaps through the rest of it and its bolts and into a water jacket.

The compressing of the tensioner piston is just makes it easy to line up the new timing set. I use a push pin, push the piston into the housing and stick it in the little hole, you set the timing and then take out the pin, which releases the piston into the tensioner.

There should be no slack on the guide side, all slack has to be tensioner side. Hopefully your chain has two colored links and not just one like mine did.

Use non permanant threadlocker on the bolts, any vibrating bolts in the timings set will back out and fall on your lower sprocket and F everything up, guaranteed. only bolts you really need to torque right are the cam bolt and crank bolt, everything else should be "german torque spec" Gutenteit.

Gutenteit, thats perfect. Im not doing the chains so i did mark the links where they line up with the sprockets just in case they jump when i take the tensioners and guides off. I probably should do the chains as well but i am far from a mechanic, and im gonna have a he!! of a time puting this back together as it is. I think my biggest obstacle is getting the lower timing chain cover back on without smearing the gasket. This thing sits sideways and it was a MF'er to get the cover off, that wheel well is a pain. Im thinking the engineer that engineered this thing was a NASA reject, cant believe everything that needs to come off to get the damn chain cover off.

One quick question, i ended up removing the AC compressor totally, when i reinstall it, do i need to bleed the air off or purge it somehow? Im not too worried about having AC anytime soon, but i know it is kind of an important thing to have on there.

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breadbox
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Joined: Tue Oct 17, 2006 4:09 pm
Car: Red 89 240sx,Black 89 Koop, White 84 720 4x4KC
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He needs more help IDK what disc he's talking about, I posted his message below.
Last edited by breadbox on Sun Feb 26, 2012 6:05 pm, edited 1 time in total.

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breadbox
Posts: 8550
Joined: Tue Oct 17, 2006 4:09 pm
Car: Red 89 240sx,Black 89 Koop, White 84 720 4x4KC
Location: Va Bch

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pawndave wrote: Well im about 85% back together, im hoping it was just the one tensioner that was extremely tight when i removed it. Im hoping it just relieved some of the tension.

One thing i did find that i didnt know fell from the engine is a rubber disc, beats the crap out of me where it came from, or where it goes. I will try to add the pic. Thanks for all your help Well i see i cant figure out how to insert a pic either. Its about 3" in diameter, probably about a 3/8" hole in the center.


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