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Porsche Motorsport Division X51 PowerKit (320 PS/235KW)

Good luck at the scrappy!

:floor:

General population is less than 1% (by that I mean Carrera etc that aren't Anni's, 'cause 100% of Anni's are X51)
 
Yes, it'd require a degree of luck, however I've got probably 7 years at my current mileage before the rebuild, so time is on my side.

But I agree, I'd likely end up buying the whole thing new in the end.
 
Not going to work in a 996.1 :bandit:
 
996 3.4 X51

First post on the forum so please be gentle :bye:

I purchased a 99 C4 recently and whilst researching the options on the VI under bonnet and in the service and maintenance book came across this thread.

The car had quite a few options at build including PCM1 and X51. A fairly comprehensive history although can't find anything relating to IMS bearing. I've read sooo many expert opinions on this in the last few days I don't know whether to get it replaced as a matter of course or to leave alone :wtf:
 
Leave it alone.

If you happen to have a clutch change (or Throwback Tuesday, RMS swap), then visually inspect and pull the outer seal.

Just remember, you have the dual-row IMSB with less than an 1/8th of the chance of dying as the 996.2 or even my current car! (indeed, most 997.1 Carrera/Targa)

Sleep well!

:sleepy:


... do fit an LTT though :thumb:

PS - :welcome: - my first Porsche was a 996 Carrera 4 3.4 X51!

gt4_1_small_399.jpg
 
Hi GT4 (and anyone else in the know 8))

Could I ask - what would your advice be for a 3.6 X51 engine?

Mine's a 2003 with 64k miles currently. I don't anticipate a great amount of miles PA (maybe 2/3k at a push - probably less), clutch was changed at Porsche within the last 10-20k miles IIRC. I've a feeling there was mention of a replacement IMS cover/seal and new bolts when the clutch was done but would need to dig through the paperwork to see exactly what it was they did. No other engine work I can recall other usual servicing, coil packs etc.

Engine seems otherwise fine but obviously would like to do whatever is recommended for peace of mind :thumbs:
 
GT4 said:
Leave it alone.

If you happen to have a clutch change (or Throwback Tuesday, RMS swap), then visually inspect and pull the outer seal.

Just remember, you have the dual-row IMSB with less than an 1/8th of the chance of dying as the 996.2 or even my current car! (indeed, most 997.1 Carrera/Targa)

Sleep well!

:sleepy:


... do fit an LTT though :thumb:

PS - :welcome: - my first Porsche was a 996 Carrera 4 3.4 X51!

gt4_1_small_399.jpg

I'll leave alone then! So many different opinions and experts on the net!

Your first car looks great! :thumbs: I have the same wheels and side skirts but standard front and rear bumpers

What are the benefits of LTT and what's the best source? Is it a Porsche or aftermarket part?
 
Advice is still as above (but you are higher risk being 996.2)

I suspect the RMS (seal) was changed (the IMS seal would not be noted as it is not serviceable part, ie very few would know about it and no OPC could touch it as there is no TSB on its serviceability - it's a whole new IMS and IMSB (with seals) if it were actioned by OPC)
 
stone40 said:
GT4 said:
Leave it alone.

If you happen to have a clutch change (or Throwback Tuesday, RMS swap), then visually inspect and pull the outer seal.

Just remember, you have the dual-row IMSB with less than an 1/8th of the chance of dying as the 996.2 or even my current car! (indeed, most 997.1 Carrera/Targa)

Sleep well!

:sleepy:


... do fit an LTT though :thumb:

PS - :welcome: - my first Porsche was a 996 Carrera 4 3.4 X51!

gt4_1_small_399.jpg

I'll leave alone then! So many different opinions and experts on the net!

Your first car looks great! :thumbs: I have the same wheels and side skirts but standard front and rear bumpers

What are the benefits of LTT and what's the best source? Is it a Porsche or aftermarket part?

Benefits are mitigated borescore (note, this is almost irrelevant on better cooled 996.1 3.4, but still advantageous).

Performance and economy improve slightly (the engine is designed to run hot to lower NOx and other secondary emissions)

The part is after market (sort of, the housing and gasket are OEM and factory Cup Cars run even cooler at 130F/55C, but the thermostat part will not be available from Porsche - although the part is from the same OEM manufacture of both high and low temp thermostats)

See here (best place FrazerPart @ £45 for housing, thermostat, gasket and delivery)


http://911uk.com/viewtopic.php?t=65932

Page 6 (for part ref):
http://911uk.com/viewtopic.php?t=117860&start=100
 
GT4 said:
Advice is still as above (but you are higher risk being 996.2)

I suspect the RMS (seal) was changed (the IMS seal would not be noted as it is not serviceable part, ie very few would know about it and no OPC could touch it as there is no TSB on its serviceability - it's a whole new IMS and IMSB (with seals) if it were actioned by OPC)

Hi,

Have just dug through the paperwork.

It did have a clutch at OPC East London circa 12k miles ago in 2011 at 51k. Then working back from there it was serviced three times by Porsche in 5k miles/2 years (45k, 48k and 50k). All at the same OPC. Seems astonishing to me but with the clutch change, a set of discs and a set of tyres plus a few misc items the previous owner spent close to £7k in 6k miles on just routine stuff.

Anyway - for some reason prior to that at around 36k miles it had a clutch change but this time at a Porsche Specialist - 'Porsheworx Engineering' (have never heard of them myself before) and the invoice shows the following:



'Intermediate shaft plate and bolts' and then on the bottom of the invoice it shows 'Replaced leaking intermediate plate and seal'

I would have assumed as you say it would be an RMS leak but they have also listed that separately - any ideas?

Anyone know of this place?

https://www.porsheworx.com

Thanks,

Will
 
Well, it is the IMS plate seal, but that not only is pretty rare (vs RMS leaks), but is also not the IMSB seal.

The plate seal is the brown ribbed "o-ring" here:

1060822_1LR1.jpg


And pissing oil here:

pic10.jpg


Now it is the free oil (normally only) the other side of that end plate that you want to treat the IMSB to.

ie strip the IMSB of its outer seal and let the block oil in (in a way, the oil out the plate and not in the seal is the EXACT opposite of what you want!)
 
GT4 said:
Well, it is the IMS plate seal, but that not only is pretty rare (vs RMS leaks), but is also not the IMSB seal.

The plate seal is the brown ribbed "o-ring" here:

1060822_1LR1.jpg


And pissing oil here:

pic10.jpg


Now it is the free oil (normally only) the other side of that end plate that you want to treat the IMSB to.

ie strip the IMSB of its outer seal and let the block oil in (in a way, the oil out the plate and not in the seal is the EXACT opposite of what you want!)

Hi again,

Thanks for the details.

I wonder if when the RMS was leaking in the past, maybe the oil leaked over the IMS plate - hence possibly a misdiagnosis or changed as a precaution if they don't usually leak? Who knows - it was circa ten years ago now.

So I guess as it's not likely to need a clutch anytime soon (done last by Porsche 12k back) and there is no sign of oil leaks from that area then probably best to leave it alone?

Not aware of any untoward noises etc so I might just do the LTT and a coolant change at some point soon for peace of mind.

Does the 3.6 X51 have any additional lubrication/oil system mods other than the baffled sump? Anything else I should be concerned about or look into?

Cheers,

Will
 

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