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ntgbrl

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Everything posted by ntgbrl

  1. After finding small chunks of plastic in my oil filter I decided to drop the motor on my '99 C4 (just shy of 150k miles) to replace the 8 chain guides I can access along with replacing the IMS bearing. After getting into the motor with a borescope I found large chunks are missing from the IMS chain tensioner paddle. To my knowledge there is no easy way to replace that part without disassembling the entire motor. So, now I need advise on which is the best way forward. I figure I have a few options here: 1) Buy a salvage motor, inspect it for junk in the oil sump and hope for the best. This allows me to sell my motor with the issue disclosed and allow me to enjoy the car hopefully for several more years. 2) Buy The Knowledge Gruppe engine assembly video/book and rebuild the engine myself. I'll probably find a whole bunch of worn out parts along the way and this will end up being a long process. 3) Buy a new short block. Getting a partially new engine gets rid of some wear items and makes reassembly quicker and easier for me. 4) Have a local Porsche shop "rebuild" the engine replacing just worn stuff along the way. 5) Have LN Engineering do a full rebuild. 6) Cut my losses and sell the car as a project. These cars are in a strange part of their life, they aren't worth much so major engine work like this is basically what the car in good working condition is worth, that makes this decision difficult. My car is high mileage and has its fare share of dings and wear, but is in good mechanical shape excluding the engine (in the last year Ive replaced all the wheel bearings, cv boots, front diff seals, shift cables, fuel sender, oil pressure sender, AOS, clutch, coolant tank, 8 chain guides, IMS bearing, probably more that I'm forgetting). What do you all think?
  2. @Tarek Sounds like you’ll need to realign the cams on the sprocket. You’ll need the cam adjustment tool (lower left tool in the pic from JFP). TDC the motor for bank 1 and lock it in place, remove bank 1 scavenge pump and loosen cam sprocket, use cam alignment tool to realign cams, tighten down sprocket, spin motor by hand several times, recheck cam timing with tool, repeat for the other side. it’s pretty simple when the motor is out of the car, I’m not sure if the cam tool will fit if the motor is still in the car.
  3. Update: The fix for this was much easier than anticipated. I didn't have to remove the cams after all, just had to loosen the cam sprocket allowing the cams to move a little bit to release the tension. Reinstallation of the oil/coolant manifold and IMS bearing went easily and re-timed the cams again per the book. Now im ready to put it all back together and reinstall the engine back into the car. Thanks for all the help
  4. Thanks for the help JFP. I forgot to mention the exhaust cam on bank 1 is locked, the install kit only came with one lock and I must have misunderstood the instructions so I placed it on bank 1. Bank 2 is currently unlocked. With the cam holders installed will I run into any issue removing the cams on bank 2 when the engine is at TDC for bank 1? I have the cam holder tools that hold the cams by their main bearings, I guess ill install those to hold the cams after the cover is off and slowly unbolt them evenly to release the pressure without damaging anything.
  5. I f**ked up and need help. My '99 C4 needed the Variocam guides replaced so I dropped the motor to replace them along with the 4 long chain guides and IMS bearing (among other things). Following the procedure from the Bentley manual I pinned the crank at TDC and removed the 3 chain tensioners. I had to remove the oil pump/coolant manifold to get at the bolts holding the long chain guides (not realizing that it supported the other end of the IMS shaft). I completed the chain guide job without much issue and put the valve covers back on then started with the IMS bearing replacement. Since I went with the EPS bearing id have to replace the oil pump hex drive so I decided to leave the oil/coolant manifold off during this process (probably where I made my mistake). Process of removing the old bearing went smoothly till I noticed the IMS shaft was way out of center before installing the new bearing. The shaft can move a small amount, but not nearly enough to get it centered for the manifold or bearing plate to be reinstalled. Please help me understand whats going on here and how I may be able to remedy this issue. I THINK since the motor is pinned at TDC for bank 1, then bank 2 cams are under tension from the lifters which is putting tension on the chain from the IMS shaft to the cams (pulling the IMS shaft to the right). That tension is also making the IMS shaft want to climb the chain from the IMS shaft to the crank. My current idea of how to fix this is as follows: Carefully spin the motor over to TDC for bank 2 which should allow me to reinstall the oil/coolant manifold (since that bank wont have tension anymore). Spin the motor back over to TDC for bank 1 relieaving the tension on the bearing side, then installing the bearing Re-time the cams on both banks Spin the motor over by hand a few dozen times and recheck the cam timing What do you think? Terrible plan, or it might work?
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