02-09-2019, 09:09 AM
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#1
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Registered User
Join Date: Feb 2019
Posts: 6
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Oil is pouring out..I need help finding the part
I have a 1998 Boxster. One night I go to start my car, and the oil is spraying on to the drive way. After lifting the car I can see exactly where it's coming from. I was told that i needed to order a new freeze plug or expansion plug. So it turns out that wasn't the correct part. I know I'm missing some sort of cap or plug I need help finding this part.
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02-09-2019, 09:46 AM
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#2
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,552
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Quote:
Originally Posted by dmonk
I have a 1998 Boxster. One night I go to start my car, and the oil is spraying on to the drive way. After lifting the car I can see exactly where it's coming from. I was told that i needed to order a new freeze plug or expansion plug. So it turns out that wasn't the correct part. I know I'm missing some sort of cap or plug I need help finding this part. 
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Looks like you popped out one of the cam shaft end plugs. These are a plastic part that costs a couple of bucks at a dealer. Bigger question is why did the cam plug pop out, they don’t do that unless something else is wrong.........
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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02-09-2019, 04:11 PM
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#3
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1997 Tip, 2018 Macan
Join Date: Aug 2015
Location: Upland, CA
Posts: 1,338
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Have you checked to see if you have oil in the coolant or vice versa? Do you have excessive smoke/steam coming out of the exhaust?
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02-10-2019, 03:34 PM
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#4
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Registered User
Join Date: Feb 2019
Posts: 6
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I haven't checked the oil or coolant and I didn't see smoke coming from the exhaust. Just oil spilling out the hole.
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02-10-2019, 09:57 PM
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#5
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Registered User
Join Date: Oct 2018
Location: Cali
Posts: 45
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AOS may be pressuring crankcase.
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02-11-2019, 06:21 AM
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#6
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Registered User
Join Date: Sep 2016
Location: Stow, MA
Posts: 918
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AOS can't pressurize the crank case. It uses vacuum to lower the crank case pressure.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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02-11-2019, 07:12 AM
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#7
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,552
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Quote:
Originally Posted by Anker
AOS can't pressurize the crank case. It uses vacuum to lower the crank case pressure.
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Correct, but if the AOS fails, blow by from the low tension piston rings will.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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02-11-2019, 07:18 AM
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#8
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Registered User
Join Date: Jul 2017
Location: Tucson AZ
Posts: 536
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Mine popped out because I blocked an oil drain in the cam cover with sealant. I was replacing the solenoid on the right rear of the engine.
My guess would be that something is restricting the oil drain. Don't know about a bad AOS.
Sure does make a mess, tho.
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2001 Boxster
2007 Toyota Highlander
2003 New Beetle Convertible, Turbo, Tip 6 speed
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02-11-2019, 07:33 AM
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#9
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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[QUOTE=dmonk;588792]I have a 1998 Boxster. One night I go to start my car, and the oil is spraying on to the drive way. After lifting the car I can see exactly where it's coming from. I was told that i needed to order a new freeze plug or expansion plug. So it turns out that wasn't the correct part. I know I'm missing some sort of cap or plug I need help finding this part.  [/QUOTE
There is a good chance that you do need to replace the camshaft expansion plug in the end of the cam pointing toward your leak.
The cam/"valve"cover must come off to do this, to prevent this from happening again replace the oe plug with a pipe plug, 1/4" I think. This is a huge,"while you are in there" project so you may want to consider if you are "IN' for the long term or sell as-is now.
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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02-11-2019, 07:37 AM
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#10
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by Brian in Tucson
Mine popped out because I blocked an oil drain in the cam cover with sealant. I was replacing the solenoid on the right rear of the engine.
My guess would be that something is restricting the oil drain. Don't know about a bad AOS.
Sure does make a mess, tho.
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This is one cause, sometimes it just comes out due to poor fitment from manufacturing.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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02-27-2019, 04:43 PM
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#11
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Registered User
Join Date: Feb 2019
Posts: 6
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Update
So thanks for helping me find the cam plug. So after installing my new cam plug, I let the car idle for about 5 minutes. Everything appeared normal. Then the rpms started to rise and idle around 2000 rpms. So I check under the car and the new cam plug blew out again. What is causing the plug to keep popping out?
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02-27-2019, 08:42 PM
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#12
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Who's askin'?
Join Date: Mar 2018
Location: Utah
Posts: 2,448
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You're building pressure in the crank case. Sounds like at least one of two things: failed AOS. Or, I've read about an oil return passage in the cam cover that gets blocked and causes the same thing.
Have you tried removing the oil fill cap while it was running? (Before the cam plug blew out? )
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02-28-2019, 11:01 AM
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#13
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Registered User
Join Date: Feb 2019
Posts: 6
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No, I haven't tried removing the cap while idling. So if my AOS has failed, shouldn't I have a check engine light or something?
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02-28-2019, 11:55 AM
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#14
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,552
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Quote:
Originally Posted by dmonk
No, I haven't tried removing the cap while idling. So if my AOS has failed, shouldn't I have a check engine light or something?
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Not necessarily. The optimum method to test the condition of the AOS is to use a digital manometer attached to an old oil fill cap. Warmed up, the system should read 5 inches of water or less; if it reads higher, or you read pressure, it is toast.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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02-28-2019, 08:40 PM
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#15
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Who's askin'?
Join Date: Mar 2018
Location: Utah
Posts: 2,448
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Quote:
Originally Posted by JFP in PA
Not necessarily. The optimum method to test the condition of the AOS is to use a digital manometer attached to an old oil fill cap. Warmed up, the system should read 5 inches of water or less; if it reads higher, or you read pressure, it is toast.
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JFP, you've probably seen a bunch of these over the years, yeah? (I mean the cam plug popping out)
What's been the most common cause, in your experience?
If my opinion below was way off the mark, I won't be offended if you correct me, haha.
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03-01-2019, 04:25 AM
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#16
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,552
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Quote:
Originally Posted by maytag
JFP, you've probably seen a bunch of these over the years, yeah? (I mean the cam plug popping out)
What's been the most common cause, in your experience?
If my opinion below was way off the mark, I won't be offended if you correct me, haha.
Sent from my SM-G930T using Tapatalk
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These pop out due to pressure problems, either from a build up of crankcase pressure due to the loss of vacuum from an AOS failure, or due to unusual oil movement caused by a blocked oil passage or having the cam end plug come out. In order of commonality, I would go with AOS failure first, oil passage blockage second, and the cam end plug last. Again, this is why you need the digital manometer, with the car idling and the plug installed, little or no vacuum in the crankcase, or pressure build up, would point to the AOS.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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03-01-2019, 06:48 AM
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#17
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Registered User
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,954
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Quote:
Originally Posted by JFP in PA
Again, this is why you need the digital manometer, with the car idling and the plug installed, little or no vacuum in the crankcase, or pressure build up, would point to the AOS.
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JFP,
Can the digital manometer I bought for the 987 Cayman be used on the 986 Boxter?
If I remembet correctly, for some reason I was not able to use it on someone's (cannot remember his name..) 986 when I help him to change the oil on his car
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03-01-2019, 07:06 AM
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#18
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Registered User
Join Date: Dec 2016
Location: Clifton, NJ
Posts: 1,135
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the sealant on the cam cover looks heavy and non OEM.
Have you had any engine work done recently?
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03-01-2019, 07:46 AM
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#19
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,552
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Quote:
Originally Posted by Gilles
JFP,
Can the digital manometer I bought for the 987 Cayman be used on the 986 Boxter?
If I remembet correctly, for some reason I was not able to use it on someone's (cannot remember his name..) 986 when I help him to change the oil on his car
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Sure, you could use it on any car, you just need to make sure the oil fill cap is the same, or like we do, have multiple cap "adaptors" for different cars.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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03-01-2019, 07:47 AM
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#20
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,552
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Quote:
Originally Posted by Quadcammer
the sealant on the cam cover looks heavy and non OEM.
Have you had any engine work done recently?
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We have seen worse than that from the factory...….
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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