![]() |
|
|
|
Registered
Join Date: Dec 2006
Location: Northern VA
Posts: 585
|
ARP Head Studs / 911 3.0
ARP Head Studs / 911 3.0
I recently had my 1980 911 SC engine “rebuilt” in that I committed to unpardonable sin of lifting it incorrectly – violated the case o-rings and caused a massive oil leak. My shop in N VA had to disassemble the engine and install new O rings at some considerable cost Prior to that I had the engine rebuilt by Motor-meister in 2001. I had them use ARP head studs. Engine has maybe 5k miles on the engine since 2001. My question is – would the techs know that the engine was using ARP head studs vs OEM or other studs – as my understanding is that regular studs use a 24.5 ft/lb torque and the ARP use 38ft/lb torque. I’ve read that the ARP hardware is a different color – is distinguishable from OEM. I’ve since put ~1300 miles on the “rebuild” and time to retorque the head studs. What do I do if my shop only tightened the head studs to 25 ft/lb? Thanks for any input Kim Langley 1980 911SC
__________________
Kim Langley 2012 Carrera / 991.1 80 911SC 97 C230 73 BMW 2002Tii |
||
![]() |
|
Registered
Join Date: Mar 2019
Posts: 1,617
|
Yes, any reputable shop would know the difference between studs and hardware.
38 lb ft of torque is usually reserved for high hp turbos where the combustion pressures exceed the force the lower torque settings can handle, causing the heads to lift under boost. The ARP's will work fine at stock torque. Contact ARP if you're unsure or don't trust us. |
||
![]() |
|
Registered
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 3,301
|
Arp
Use the stock torque.
|
||
![]() |
|
Registered
Join Date: Feb 2007
Location: Northeast
Posts: 464
|
I'm curious how you wreck o-rings lifting it wrong?
And a "motor meister" rebuild is suspect enough!
__________________
Mark www.exotechpower.com 1981 Targa-messed with. 91 C2 supercharged track rat Radical Prosport-irritates the GT3 guys 40 years of rebuilding services |
||
![]() |
|
Registered
Join Date: Dec 2006
Location: Northern VA
Posts: 585
|
prschmn:
> I used the infamous telephone book under the center of the engine / circular oil sump case. I guess I was "off center" enough that the lift imparted a wee bit of extra strain of the case O rings - resulting in major oil leak at the case seam. I had used that center lift method multiple times since I got the 911 in 87 with no problem... but it only takes one time to change my process. Thanks all for the input. As the famed Faber College [Animal House] motto goes >> Knowledge is Good.
__________________
Kim Langley 2012 Carrera / 991.1 80 911SC 97 C230 73 BMW 2002Tii |
||
![]() |
|
Try not, Do or Do not
|
Motor Miester was notorious for using a steel head stud they had manufactured to their specs. They used a common steel, had no ground surfaces and the threads were cut not rolled. In short, cheap junk. They other issue is the coating is black oxide that makes them look like early ARP head studs.
They also made head studs that were powder coated red.....be on the look out.
__________________
Henry Schmidt SUPERTEC PERFORMANCE Ph: 760-728-3062 Email: supertec1@earthlink.net |
||
![]() |
|
![]() |
Registered
Join Date: Jan 2003
Location: Langley,B.C.
Posts: 12,000
|
I still fail to see how you created a massive oil leak.....
__________________
Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
||
![]() |
|
The 9 Store
Join Date: Dec 2009
Location: Wilmington, DE
Posts: 5,350
|
I'm curious too. I've never heard of creating an oil leak in that manner. I ship out and receive engines all the time. Never any issues propping it with blocks of wood.
__________________
All used parts sold as is. |
||
![]() |
|
Registered
Join Date: Dec 2006
Location: Northern VA
Posts: 585
|
thanks for the additional input..
I'll advise my shop that motor meister was the engine rebuilder - and they claimed to have used ARP head bolts - at least I paid $$$ for ARP. Had I known then 2000 - what I know now I would not have used MM for the job. But not much I can do about it now.. The shop I'm using now in N VA is noted as a first class operatiopn... gets excellent reviews - maybe it's a case of MM biting me in the ass 22 years later...
__________________
Kim Langley 2012 Carrera / 991.1 80 911SC 97 C230 73 BMW 2002Tii |
||
![]() |
|
The 9 Store
Join Date: Dec 2009
Location: Wilmington, DE
Posts: 5,350
|
MM was known for charging people for high end parts and then using the cheapest worn out parts that they could scrape together. Every part and dimension on the engine is suspect. They duped dozens of not hundreds of people over many years.
__________________
All used parts sold as is. |
||
![]() |
|
Now in Florida !
Join Date: Aug 2012
Location: York Beach, Maine and Anastasia Island, Florida
Posts: 406
|
I'm also confused how this would damage a case o-ring. If truly o-ring damage, my is return tube got stressed with the off-center phone books.
__________________
1983 911SC Coupe Hot Rod - Platinum - Twin plugged 3.4, DC-60 cams, PMO 50's, 1 3/4 headers, Bill Rader 915 w/LSD 1976 914 2.0 Lime Green Metallic - Completely stock |
||
![]() |
|
Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
|
I'm guessing he means the oil return tubes.
__________________
Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
||
![]() |
|
The 9 Store
Join Date: Dec 2009
Location: Wilmington, DE
Posts: 5,350
|
I don’t think it was oil return tubes if the shop had to disassemble the engine at considerable cost. Expanding oil tubes and labor shouldn’t have been more than a couple hundred.
__________________
All used parts sold as is. |
||
![]() |
|
Registered
Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,711
|
I'd guess that the return tubes were bent, during the engine lift....and the shop didn't know that the extendable return tubes would fix the problem without taking the engine apart....likely a great shop, but perhaps not focused on Porsches.
regards, al
__________________
[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
||
![]() |
|
7.0:1 > 11.3:1 > 7.0:1
|
|||
![]() |
|
Registered
Join Date: Dec 2006
Location: Northern VA
Posts: 585
|
Jim2 :
Exactly. I had used the technique for years of using a thick telephone book with my floor jack and lift at the engine sump - and never experienced any issues. It allowed an easy center lift and then I could use jack stands at the torsion bar points to support the back end.
__________________
Kim Langley 2012 Carrera / 991.1 80 911SC 97 C230 73 BMW 2002Tii |
||
![]() |
|
Registered
Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
|
If you are lifting the car, there is no good reason I can think of (but I may be missing one) to lift the rear by the sump plate area. Lift at the rear of the engine, under where the motor cross mount attaches. Either on the base of the mount, or on the case immediately forward of it. That way no bending force on the power train. It doubtless can take it, but why.
Holding the engine up by the sump should be reserved for removing the engine while leaving the transmission in the car (to avoid having to remove CVs and sway bars, mainly). On the other hand, what seals. Agree with others that this should not be the oil return seals unless the shop was not knowledgeable - though this seems the most likely given the few facts presented. No way this could harm the through bolt seals. Flywheel/other end of crank seals? Naw. |
||
![]() |
|
Registered
|
Three things:
1. I don't think lifting by the engine will cause a massive oil leak. 2. The Motor Meister rebuild war probably a huge waste of money. 3. No 2 is probably the cause of no 1.
__________________
Magnus 911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI. 911T Coupe -69, 3.6, G50, "RSR", track day. 924 -79 Rat Rod EFI/Turbo 375whp@1.85bar. 931 -79 under total restoration. |
||
![]() |
|