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Daily banter For everything, and anything that doesnt fit in elsewhere |
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#91
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"you MUST not torque up using the belt method, you are putting the full force of the torque against the woodruff key on the pulley which is only a cast piece, you will sheer this and destroy your engine.... the workshop manual and how MJ does it is correct.
The factory way of holding the crank whether V8, V6 or inline 5 are the only way to do the belts..." I understand what you are saying here but I don't think it is so streight forward." Putting the full force on the key" assumes thet the shoulder of the bolt is in contact with the end of the crank. This therefore would mean that any further turning force is trying to turn the crank and (as you say) if the pulley is held by the belt, risks the key shearing off. If the shoulder of the bolt though is resting on the front face of pulley, is not the inverse true? whereby holding the pulley prevents the turning force from trying to turn the pulley as the bolt bites into the aluminium. If the bolt bites into the aluminium pulley face whilst the crank is locked, could this not result in the same problem? The bolt will try to turn the pulley. There is also the washer on the bolt to consider which should help prevent this. I've also heard stories of the pulley key shearing even when using a crank pin. I will use the pin in the future if that is what the book says and MJ recomends but I don't think that either way is bullet proof.
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Audi S8 D2 2002 88k mls Ebony pearl effect black. Grey interior. |
#92
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Quote:
The pulley is steel. The new bolt has a waxy substance between the bolt head and the washer. When its being torqued, the washer stops turning as it contacts the pulley and the waxy stuff squishes out as the bolt turns. I suspect this is by design to not put a rotational force on the pulley. |
#93
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Only if it's one of her former patients.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds |
#94
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I recently replaced front crank seal on d3 and I initially reused the bolts and torqued them without difficulty but when I went to do the 2 no 90° turns i only got about 60° on the ist turn and stopped as I was concerned that they would ring off ( seriously tight) I then ordered a set of new bolts which I torqued and did the 2 90° without concerned ,i had thought it was down to the originals being stressed ,i wonder now if they were waxed
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Audi S8 D3 07MY 5.2 V10 Daytona Grey With Bang & Olufsen Advanced Sound System, Advanced Parking System, TV Analog/ Digital, Rear/Back Window blinds, Front and rear heated seats, Alcantara Roof, Extended leather Pack 2, Extended Aluminium pack, Carbon and Aluminium trim packs, RSE, PS2. Daily driver Audi A8 d4 2014 phantom black 3.0 tdi Previously owned Audi 80 1986 1.8 white Audi 80 1990 2.0 red Audi A4 1996 1.9 tdi green Audi A6 1.9 tdi 2000 blue Audi tt 225 2000 silver Audi s8 d2 2002 fe grey Audi a8 4.0 tdi d3 2006 black Audi a8 3.0 tdi d3 2010 black |
#95
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You can see the little spots of wax in this pic. I never thought about it before this discussion - it was just something that happened. Its not there on the V6 bolt afaik, but thats a steel block so a bit stronger. Possibly its on the V8 one to mitigate the effect of the twisting torque on the alloy block? If I remember I will get a better look at the next new one.
New thermostat, the correct way up Timing gear back on I had the top water pipe powder coated with the sump since it was pretty scruffy |
#96
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Quote:
Deviate from that at your peril on critical items as cam belt replacement how many times have you seen specialists using tipex to mark cam locations only for the cam timing to be out as they’ve not used the correct cam locking tools???
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89forever Current stable..... ‘07 A8 D3 4.2tdi ‘08 S5 ‘09 A4 Avant 2.0tdi ‘04 TT 225 |
#97
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I made no reference at all to camshaft timing and completely agree that short cuts with this procedure and not using the correct tools is simply asking for trouble.
As for manufacture spending millions on research and development, of course they do, and yet they still get it wrong sometimes. I have already conceded that in the future I will use the crank pin to hold the crank. This is not because the manual says so but because it has been tried and tested by someone with much more experience of working on these cars then me (MJ). That surely is the point of this forum. Not degenerative by any means. As long as we are polite than we all benefit from the exchange of ideas and learn from these exchanges.
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Audi S8 D2 2002 88k mls Ebony pearl effect black. Grey interior. |
#98
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A while back I mentioned to a good family friend that I was going to have the engine completely inspected after the accident damage work was repaired and he said it’s not worth it.
He said you had the timing belt, tensioners, crank pulley etc work done a few years back and that he wouldn’t waste the money. I told him to watch this space... Now, I would consider the garage that did all of this work previously to be a reputable one, and yet I still see pictures that scare the excrement out of me. Crank pulley not seated correctly, thermostat not installed the right way round, timing not correct. Just these things alone is why I knew this would be worth while. Thank you MJ. Your attention to detail and can-do approach to tasks is unparalleled
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2002 S8 - Irish Green Pearl. Cat N (saved by the D2 Doctor ) 1988 E30 Coupe - Royalblau Metallic 2003 S4 Avant - Light Silver Mettalic 2016 S5 Coupe Black Edition - Ibis White Last edited by RICKY D; 27th March 2021 at 09:55 AM. |
#99
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After the horrors of the murple, all this stuff is just minor niggles
Freshly powdercoated sump: Good crank pulley on the left, less good one on the right. The crank sprocket is very hard high-carbon steel whereas the pulley is much softer so when it was rattling about the sprocket both wore away and displaced the steel of the pulley and ate in to it by a couple of mm. The material which was worn away is visible as rusty dust, but most of it was just smushed around in to the pattern of the sprocket. Good pulley mounted up. Replacement fan bearing The engine is back on the separating table, but the wrong way round so that I can replace the crank rear main seal as this was leaking quite badly. Audi won't sell you a seal - there isn't even a part number for it. Instead, you have to replace the entire rear plate (for £300) which also requires the upper sump to be removed Luckily Elring are having none of this silliness and will happily sell you the seal on its own for £25 or so. You just have to use the part number for the 2.5 TDI seal to find it New seal in place Drive plate back on with new bolts Engine spun round and back on the gearbox. I can't attach the converter until the morning as the rear main seal has to sit for 4 hours before the crank can be turned, presumably to allow the material to relax in to position after fitting it. Pre-filling the gearbox through the oil cooler return. I put 1L in the converter and pump while the sump was off, and put another 8L in like this so the level should be pretty close when it starts up again. Mannol AG52 again, as the 5HP seems to respond really well to this stuff and its £4 a litre instead of £12 for OE! I have also used Mannol in the diffs (£6 a litre instead of £16) and in the engine too (same price but comes in a barrel instead of a stupid cardboard wine-box). It seems to be well made stuff at sensible prices so is going to be my default choice from now on |
#100
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds |
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