2006 Pathy VQ40DE swap notes - long

A forum for the legendary Nissan Pathfinder and Infiniti QX4.
thePoodleFarmer
Posts: 1
Joined: Tue Nov 10, 2020 5:29 am
Car: 2006 Nissan Pathfinder

Post

Thanks to the Forum for being such a great resource. I just completed swapping the VQ40DE engine in my wife's 2006 Pathfinder - successfully. The downloadable FSM sections were particularly valuable as a starting point, although at times it was necessary to deviate from a few things. Also searching for answers within the forum to specific challenges often brought results of varying quality. So here are my own notes and comments.
1. This swap was done by myself, unassisted. No impact tools, no power tools. 40 years of collecting good quality hand tools. A couple of jackstands with not enough room underneath to roll over. No heated shop, the last days were well below freezing in my 1930's vintage barn. I was reluctant, but watching this video on YouTube was a great confidence builder and with COVID lockdowns I had lots of time. LINK to YouTube guy. [youtube]https://youtu.be/rsvh-_7v79M[/youtube]
2. Things I didn't do that are on the list of instructions for engine removal in the FSM. Keep in mind that the instructions in the EM refer you to more detailed information in other sections such as AT, PS etc.
DID NOT do any of these things
  • Partially drain A/T fluid
  • Release fuel pressure.
  • Remove radiator. Left it there, protected with a piece of cardboard for cushion and a piece of corrugated plastic (old election sign) cut to suit for increased resistance to damage.
  • Disconnect the PS reservoir from the pump. Release it from the bracket and when you remove the PS oil pump the entire assembly can be maneuvered out of the way.
  • Disconnect the fuel hose at the engine side connection. You will see why later.
  • Remove the A/T oil level indicator and indicator tube. That looked frought with disaster.
  • Remove front final drive assembly. More disaster loomed large. I didn't even remove the front driveshaft.
  • Install fancy engine slingers to left and right bank. Did note where they connected, but used chains instead.
3. Things I did do that are not on the list of instructions for engine removal in the FSM.
  • Remove intake manifold collector, throttle body and disconnect all hoses.
  • Remove fuel injectors and fuel tube from intake manifold, complete and connected and lay carefully to the side.
  • Removed both rocker covers, coil packs and spark plugs. Makes turning over the engine easier. And lifting chains less likely to crack plastic things.
  • Removed idler pulley and the auto belt tensioner complete with the bracket to gain added clearance.
  • (Should have) removed oil filter and cooler for additional clearance. Easier to do than removing the radiator. Did this for the replacement engine before dropping it back in.
  • remove the RH (only) engine mounting bracket (lower) in addition to the insulators and heat shield on both sides per the instructions.
  • While you are removing that bracket, you will notice that there are AT cooler lines secured to the block. Good time to remove and wire the lines off to the side a bit. They will want to hang up on the oil pan rail, you have to watch like a hawk coming out and going in.
4. Spreader and lifting slings.
Spreader bar.jpg
I used a 3x4 chunk of hard maple about 30" long that I had handy. Drilled in the middle for an eyebolt that was used for a utility pole guy wire connection. Made a quoit(rope ring) from a scrap of 3/8 7x19 wire rope to connect the eyebolt to the pin on my ancient 3 tonne engine hoist. Grabbed a chain with grab hooks on both ends and split it half, so I had a chain for each side that could be secured to the block and length adjusted with the grab hooks.The chain bites nicely into the maple so it is easy to adjust but (reasonably) secure from slipping under load. Use the bolt locations in the FSM to secure the chain -
passenger side single point.jpg
one point on Bank 1, two bridle on Bank 2 so it doesn't do a back flip once free and suspended in the air.
Drivers side bridle hitch.jpg
. Metric bolts, I had some brake caliper bolts that were the right thread and grade.
5. Once you have the hoist connected, raise the engine slightly to remove the insulators. In place of the insulators, place 6" long 2x lumber scraps (I used 2x3 cause it was handy) and set the engine back down slightly lower now than before.
lower engine blocking.jpg
Now you can safely climb up on top of the engine and access those upper 3 or 4 bolts that secure the bellhousing to the block from above. A standard socket and a ratchet with a telescopic handle (or short sliding snipe if you don't have fancy tools). .
6. Crawl underneath and get the side bolts, and the torque converter bolts. I rotated the crank until I could see one bolt through the access port, then marked the harmonic balancer pulley with chalk at 90 degree intervals. A 19mm deep socket, 24" breaker bar resting on the frame rail prevents rotation. Remove one bolt, go back topside and rotate 90 degrees, crawl under and remove next bolt. Repeat.
7. Raise engine up a bit, block the transmission pan with a mechanical jack to support before finally removing the last 2 lower bolts securing the transmission to the engine. Then pull the engine free from the transmission.
8. Wiggle, lift, shift, pull, jimmy, raise, swing, finesse. Watch the engine as you pump the hoist. If it does anything but come straight up then it is probably hitting something. With all the accessories off the front of the engine, you have a good bit of room to pull forward.
Engine out! Congratulations. Now you can get ready to put in the replacement. Preparation while it is on the bench will save you a lot of grief and aggravation when you have it dropped back in place.
  • Make sure new engine has transmission dowel pins in the same location and quantity as the old engine.
  • Make sure you reset the bushings for the alternator and PS pump brackets so the old accessories fit the brackets of the new engine. The alternator one is on the alternator, clamp in a vise with a pipe and squeeze it flush. See picture on how to reset the PS bracket sleeve. Insert pump bolt in bracket, thread on the blind nut REVERSED so the flat side faces the bushing.
    ps pump bushing reset.jpg
    Thread the bolt through enough to pilot, then a few raps with a hammer to set it back fully.
    ps bushing.jpg
  • Now is the time to change things like timing chains if the engine is old. Remove inspection covers and see, don't pull the timing case cover if you don't need to.
  • Pull the oil pan and clean it out. Easier on the bench than in the frame. Make sure the new engine has a good drain plug and gasket, sucks to be ready to fill with fluids and find out that it is fubar.
  • If you need to pull the timing case cover, getting the harmonic balancer bolt loose is a pain. A couple of 7/16x2" bolts through the flex plate secured by nuts will give you a place for a long bar to keep the crank from rotating while you break the balancer bolt free.
    Flexplate.jpg
  • Get a metric tap & die and chase the threads for the exhaust studs and the flanges. Make sure thery are cleaned up, and that you have the correct hardware. I found some are M10x1.5 and some were M10x1.25 which was annoying, but not frustrating once prepared.
  • Transmission prep - if it moved, rotate the torque converter so a lug is straight down. Take some chalk and colour one side of the lug so once the engine is in place and you are looking through the hole in the flexplate you know whether you need to tweak the crank CW or CCW to lineup. And on the engine, make sure you have the crank rotated so a hole in the flexplate is similarly pointed straight down. Mark the balancer at 90 degree points now while you are thinking of it.
  • Make sure the new engine has the LH (only) engine mounting bracket (lower) in place. Also make sure it hasn't been whacked out of alignment, that the long bolt that goes up through the insulators lines up with the hole in the lower bracket. Easy to fix now, hard to whack with a hammer later if you didn't pull the front final drive. Picture.
    rh engine isolator bolt.jpg
  • Pull the rocker covers, fuel injector rails, intake manifold collector, etc. Look at all the brackets, make sure that your new engine isn't missing any that would be hard to swap over once it is between the rails. Some of those bolts are pretty hard to access once accessories are connected. SEAL the intake runners - tape, cardboard, don't let any foreign objects drop in there now. Cover and pad the top end with some pillow covers, drop clothes, etc. You are likely going to be climbing up there again to secure the top transmission bolts.
  • Attach the lifting chains and spreader bar as it came off the old engine. Leave length on the chains, don't choke it tight. Getting the engine almost in and having the spreader hit the cowling or brake booster is annoying as can be. Lift it up, adjust the chains on the spreader log so it lifts fairly level side to side.
I think it's ready to go in now. Reassembly is the reverse of removal. Get it down between the rails. Watch out for those pesky transmission cooler lines, filler tube, etc. If it doesn't go down evenly it is hitting something somewhere. Line up the dowel pins carefully, and start two bolts. Don't force it! Those pins are a tight fit, if you try too hard to pull it tight when they aren't square and concentric you will mess up the mating holes and it just gets harder to fix. Keep the gap even all the way around as you pull it together with the two bolts closest to the dowel pins. Get the two bottom bolts in, set the engine down on the 2x blocks that you saved and then proceed with the torque converter bolts, upper transmission housing bolts, etc etc. Once fully connected you just work your way backwards. Take your time. Don't break anything now. Sorry for the lack of lots of pics and video. I don't multi-task well, too easy to get distracted and forget where I was. Comes from being old. Older than those AC-Delco fender covers.
HTH the next guy that wants to give it a shot. Pictures are in as attachments, hope I did that right. I don't have any pictures in a Cloud account anywhere.

Al


User avatar
mdmellott
Posts: 1269
Joined: Mon Sep 02, 2019 3:32 pm
Car: '13 Kia Soul+ 2.0L AT
'02 Pathfinder SE 3.5L AT P/4WD
Location: SF Bay Area, CA

Post

Old school. I love it. Nicely done.


Return to “Nissan Pathfinder Forum / Infiniti QX4 Forum”