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jchapura replied to timbo's topic in 997-1 Series (Carrera, Carrera 4, Carrera 2S, Carrera 4S)If you are referring to the black area near/below the shoulder - it is a marking from during my disassembly process.
jchapura replied to timbo's topic in 997-1 Series (Carrera, Carrera 4, Carrera 2S, Carrera 4S)I don't think there should be bolts in there. I happen to still have mine open for putting in coilovers. The aluminum plate is what the Bose subwoofer shelf sits on and there doesn't seem to be any bolts/studs coming from it (that would mate with the holes). As for the broken clip - I don't have that on my 2005 C2S as can be seen in my pic. It's been a few months since I took mine apart so I may need some help from you when I put it back together. 🙂
Very weird. Never heard a story like this. What changed since it was last driven; what allowed them to not break the last time it was driven? Some sort of accelerated fatigue...
Do these seem like reasonable steps to change-out the tensioners? All comments welcome. Tools: -Tensioner torque 59 ft-lb -32 mm socket -fairly large 6 mm(?) hex key (for bank 2) Reference info: -while facing the rear of the car; looking towards the front -cylinders 1,2,3 - drivers side, left side; this is bank 1 -cylinders 4,5,6 - passengers side, right side; this is bank 2 Parts: -primary/ims chain tensioner - one ring marking; 996-105-180-58-M100; installs on crankcase near oil filter area; rear of engine -cylinder bank 1-3 - two rings marking; 996-105-186-02-M100; left lower area on cylinder head; points straight down -cylinder bank 4-6 - no marking; 996-105-188-02-M100; right upper area on cylinder head -crush washers usually come with the tensioners -camshaft plugs - 4x - 996-104-215-54 Steps: -index the engine to TDC -remove the bank 1 camshaft plugs (looking into engine bay; to the left and look down) -inspect the camshaft slots to ensure they are straight up and down, if not rotate the engine 360 deg; inspect the camshaft slots to ensure they are straight up and down -lock the crank/pulley with a 5/16 inch or 8 mm pin -lock the camshaft for bank 1, rear of engine, left side -pump up the primary/ims and bank 1 tensioners in oil prior to insertion -replace the IMS tensioner (has one ring) (flywheel end of engine; right side of engine; a few inches up from bottom of engine) -replace the bank 1 tensioner (two marking rings) (left side/bottom of engine) -remove the camshaft lock -install the new camshaft plugs -remove the TDC pin -rotate the engine 360 deg -lock it with a 5/16 inch or 8 mm pin -lock the camshaft for bank 2, front of engine, right side -move the AC compressor out of the way -pump up the bank 2 tensioner in oil prior to insertion -replace the bank 2 tensioner -install the AC compressor -remove the camshaft lock -install the new camshaft plugs -remove the TDC pin
With regard to my 2005 C2S (three chain, right?), can I lock the pulley at TDC, and then use a single 9686 tool to lock the camshafts on one side but swap-out all three tensioners, one-by-one (without moving the 9686 tool)? If a single 9686 tool position can work for all three tensioners, which side should it be placed on - drivers or passengers?
So, I got up under car to start taking measurements for the camshaft lock (similar to 9686) and noticed how little room there was at the front and rear of the engine to place the tool. In the rear (drivers side), the underside of the engine mount area seems to be in conflict. In the front of the engine, part of the frame crosses through the work area. Can the standard lock tool be put into place (front and rear) while the engine is in the car?
I too haven't read that there's specific mileage threshold (although I've read that they do "age" - read - leak down and/or lose tension). I did read from Raby that there should be no noise from the chains, for example, upon cold start (even transient). I'm hearing a 1-2 second period of chain rattle at cold start so I'm going to preemptively change the two easy ones first and see what rattling is left over. I've read it's usually the IMS chain tensioner which is one of the easy ones. I'll do it at my next oil change even though not a lot of oil leaves the case. You do have to have one special tool (actually two of the same) - to lock the camshafts in position when you're locked at TDC with a 5/16 inch drill bit. I plan on making (the lock tool is rather simple) them from some aluminum flat bar since the cheapest I could find for one (as part of a kit) was $60.
I've got the three chain tensioners sitting on the shelf waiting to change with the oil in few weeks. From the bottom, the IMS (I think) tensioner is the easiest one - totally exposed for a socket. The other one accessible from the bottom is "fenced" by a couple of metal coolant tubes. Can the coolant tubes be temporarily moved out of the way by undoing their straps to gain sufficient access to the tensioner? Or, do the tubes have to come out by decoupling them from their in and out rubber hoses? (I'm trying to avoid cracking open the coolant system...) Does the cam have to be locked in TDC with a pin through the pulley hole? Is there still a chance that any of the three chains could jump a tooth while removing the existing tensioner or putting in the new one? I plan to complete each tensioner completely before moving to the next one (two tensioners will never be out at the same time). Any other tips or tricks? Thanks for any advice.
jchapura replied to Uwon's topic in 997-1 Series (Carrera, Carrera 4, Carrera 2S, Carrera 4S)About 14000 miles ago (~17 months) I replaced the seemingly original water pump with a Pierburg (remember to replace the 7 mounting bolts). I did change to a low temperature thermostat at the same time. (I bench tested the temperature-at-open values and temperature-at-full-open values because I found two seemingly defective ones.) After it was all buttoned-up, in hot weather, the incidents of oil temperature spiking increased. (Normal cruising 100F ambient, yielded 200F oil temp; spiking meant to me elevated RPMs 4k+ for just a dozen seconds or so, took me to 220F oil temp; and I would say the oil temp did not recover quickly or at all some times.) Since I was pretty sure I had a good thermostat, the only other thing I think it could be is coolant flow (meaning it was the same potentially dirty radiators before and after, for these observations). The Pierburg just didn't seem to flow the needed amount of water when the system needed it the most. [Later that summer, I did take off the front bumper cover to clean the condenser and radiators - no change in "spiking" incidences.] So, when I change it again (~40000 miles), I will probably be going with the genuine Porsche pump.
jchapura replied to 224STU's topic in 997-1 Series (Carrera, Carrera 4, Carrera 2S, Carrera 4S)Your 3.9 indicates a rebuild/upgrade perhaps and you may want to ask the builder. Viscosity is just one part of the oil equation. The additive package is very important. I use JGR DT40 in hot/moderate Texas, USA. It's recommended by one well known engine builder.
jchapura replied to kodiak333's topic in 997-1 Series (Carrera, Carrera 4, Carrera 2S, Carrera 4S)I installed some Gundo hacked mufflers and love them. Looking back I should have just modified my stock mufflers.
jchapura replied to HalM's topic in 997-1 Series (Carrera, Carrera 4, Carrera 2S, Carrera 4S)I too have a less-than-smooth 1-2 shift. Not very bad but noticeable compared to the other transitions. I have changed the oil and used PTX. I have Function First inserts for the tranny and semi-solid motor mounts. All the changes were done separately; none of them really benefited the 1-2 transition. What was the part number of the tool you ordered? Have you found a source for the adjustment procedure? Thank you for reporting back your results. I will too if I do the adjustment. Update: I found the part number [shift adjustment tool #SKU9X7 Suncoast] and I just saw a post on the replacement procedure and it looks like the adjustment threads are in the center console rather than the transmission end so I probably won't be taking all that apart for a relatively trivial issue (or unless your results are really fantastic).
Could be. Could also be a pulley. Safely use a mechanic's stethoscope to try to narrow down where the squeak is coming from. If you don't have a stethoscope, I've used a long small diameter metal rod... Just be careful when the engine is running.
I ordered an assembled 60 inch remote bleeder from Eric at BAT in Florida for about $50. I hope the M10 terminating fitting, that replaces the bleeder, fits.
I found in post (http://rennlist.com/forums/porsche-cup-cars/771311-clutch-bleed-extension.html) that the 997 and 996 are different, 10mm and 6mm, respectively. I've written to BAT to see if they can put one together for me.