Discussion
follow on from last night,my 996 c2 year 2000 has no compression on no1 cylinder,50 pounds on no 2 and 75 on nomber 3 all on one side of the engine,,,,,fed up,can,t get the cylinder head of while next week because the garage where its at is fully booked while then,now someone has sugested that the timeing could of slipped on that bank,someone else said headgasket and then someone realy put the boot in and said it could have cracked a cylinder sleave,and you cant have them re sleaved or so they said???but that would surely only put the compression down on one pot rather than all?????no oil in water or water in oil,no loss of water or oil, please give your opinions to my problem thanks a fed up pistonheader
Edited by d9dgydave on Tuesday 3rd April 19:49
Hi Dave
I think your trouble is more timing chain related.As this occured so quickly I think you can rule out any Head gasket,piston or liner problems.There are 5 timing chains on this engine and one of them may have jumped or snapped.The intermediate shaft bearing could have failed allowing the chain to do this.It sounds as if the valves are bent on one bank of the engine.I would get them to do a cylinder leakage test on the low cyls this should tell you what the trouble is. Before you start ripping the engine apart i would try talking to Baz at Hartech as the are one of the few companies who can recon these engines
Fingers crossed Bob
I think your trouble is more timing chain related.As this occured so quickly I think you can rule out any Head gasket,piston or liner problems.There are 5 timing chains on this engine and one of them may have jumped or snapped.The intermediate shaft bearing could have failed allowing the chain to do this.It sounds as if the valves are bent on one bank of the engine.I would get them to do a cylinder leakage test on the low cyls this should tell you what the trouble is. Before you start ripping the engine apart i would try talking to Baz at Hartech as the are one of the few companies who can recon these engines
Fingers crossed Bob
Dave
Hi,The point I am trying to make is these engines are very compicated and there is no way you can rebuild them without the special tools. I have just brought the tools to take the heads of and retime the chains and they have cost me £1000. If a normal garage takes your engine apart, they are just going to tell you that you need an exchange unit and you then have your car in there w/shop what choice have you got,they have got you by the gonads. Also Porsche will want your engine put back together before they accept for part exchange. If you get the car transported to Hartechs he carries a stock of second hand spares and will be the cheapest option.I have no ties with them but reading his past comments on this forum the guy knows what he is talking about. With these cars it is so easy to be ripped off if they think you are a layman.
Wishing you luck Bob
Hi,The point I am trying to make is these engines are very compicated and there is no way you can rebuild them without the special tools. I have just brought the tools to take the heads of and retime the chains and they have cost me £1000. If a normal garage takes your engine apart, they are just going to tell you that you need an exchange unit and you then have your car in there w/shop what choice have you got,they have got you by the gonads. Also Porsche will want your engine put back together before they accept for part exchange. If you get the car transported to Hartechs he carries a stock of second hand spares and will be the cheapest option.I have no ties with them but reading his past comments on this forum the guy knows what he is talking about. With these cars it is so easy to be ripped off if they think you are a layman.
Wishing you luck Bob
yep i know wot your saying but its my brothers garage and if he has to buy ant tools he will,but it wont stop me giving them a ring tomorrow,just been talking to him and he,s pushing me in tomorrow, wot special tools do you need???could do with a realy good workshop manuel aswell??? and plenty of good look aswell,he,s going to start buy checking and resetting the timing before he does anything,hopefully it will show that it has sliped ,,,then it will be then the head of for abit of valve repair,,,anything else you can sugest would be welcome thow rgds Dave
d9dgydave said:
yep i know wot your saying but its my brothers garage and if he has to buy ant tools he will,but it wont stop me giving them a ring tomorrow,just been talking to him and he,s pushing me in tomorrow, wot special tools do you need???could do with a realy good workshop manuel aswell??? and plenty of good look aswell,he,s going to start buy checking and resetting the timing before he does anything,hopefully it will show that it has sliped ,,,then it will be then the head of for abit of valve repair,,,anything else you can sugest would be welcome thow rgds Dave
Nicest possible way mate is not to let your brother anywhere near it.
This is not a stock Rover or Merc or anything like that.
This is a seriously complex piece of engineering. Regardless of how good your brother might be it's a little like asking a heart surgeon to do brain surgery. Baz is as close to Prof. Sid Watkins as you will get when it comes to these things from what i have heard and read.
Dave
You can get the Manuals on Ebay in cd form. The tools are 3 adj cam chain tensioners,4 cam shaft holding tools and a tool that holds the cam in place at the non drive end so you can get the cam covers back on plus the the most important tools that you use to turn the cams and hold while you tighten the cam spockets. On these engines a chain comes up from each bank to drive the ex cams, A short chain then drives the inlet cam BUT the cam loops around the vario cam adjuster which are prone to failing.Also if the cams are lifting the valves on the cyl at the op end to the chain you can strain the cams as the cam cover has 3 of the bearing caps formed in it.
Take care Bob
You can get the Manuals on Ebay in cd form. The tools are 3 adj cam chain tensioners,4 cam shaft holding tools and a tool that holds the cam in place at the non drive end so you can get the cam covers back on plus the the most important tools that you use to turn the cams and hold while you tighten the cam spockets. On these engines a chain comes up from each bank to drive the ex cams, A short chain then drives the inlet cam BUT the cam loops around the vario cam adjuster which are prone to failing.Also if the cams are lifting the valves on the cyl at the op end to the chain you can strain the cams as the cam cover has 3 of the bearing caps formed in it.
Take care Bob
d9dgydave said:
ok but an engine is an engine the timing might be alittle tricky but if one man can do it so can the next,its not his first rebuild its probably his 1000 times 4 mechanics all very capeable,from lotus to tvr/ slk compressers....but i,ve got to say you both unnerve me alittle
sorry to hear your problem. my 2p would be to take the advice you've asked for on here. there's a lot of very clued up, experienced chaps on here (no disrespect to your brother - we can't all be experts in everything).
if it was my porsche, i'd want someone doing it that had done them before and knew what they were doing - and that usually means a word-of-mouth recommendation - like you've had several of - recommending the same chap.
your car though, and your choice.
Dave
Unfortunatly I live in essex otherwise i would have gladly given you a hand.I dont think you will be able to get the heads off in the car on a 996 you have to drop the lump out.Also in 2000 Porsche changed the drive chain from the crank to the intermediate shaft to a Hyvo type and the only way you can change the two main chains is to strip the lump right down. Ive rebuilt many different engines in my time but these M96 units with 5 camchains,3 oilpumps and seperate crank housing within the 2 crankcases are right piece of art ,In fact they are more complicated than the GT3 & Turbo units.
Bob.
Unfortunatly I live in essex otherwise i would have gladly given you a hand.I dont think you will be able to get the heads off in the car on a 996 you have to drop the lump out.Also in 2000 Porsche changed the drive chain from the crank to the intermediate shaft to a Hyvo type and the only way you can change the two main chains is to strip the lump right down. Ive rebuilt many different engines in my time but these M96 units with 5 camchains,3 oilpumps and seperate crank housing within the 2 crankcases are right piece of art ,In fact they are more complicated than the GT3 & Turbo units.
Bob.
Hi Bumcrack
I agree its all to easy to be wise after the event but to be fair to Dave in all my years in the motor trade i have never seen anything like this warranty situation with Porsche.
I have not got one,mainly that I can do most jobs on them myself. Also no way I am going to pay £100 an hour to have people work on it.
Sounds like the warranty is a lot cheaper than a recall!
Bob
I agree its all to easy to be wise after the event but to be fair to Dave in all my years in the motor trade i have never seen anything like this warranty situation with Porsche.
I have not got one,mainly that I can do most jobs on them myself. Also no way I am going to pay £100 an hour to have people work on it.
Sounds like the warranty is a lot cheaper than a recall!
Bob
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