Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> Random air cooled question, Weird behavior after oil change
Jett
post Nov 23 2023, 05:54 PM
Post #1


Senior Member
***

Group: Members
Posts: 1,640
Joined: 27-July 14
From: Seattle
Member No.: 17,686
Region Association: Pacific Northwest
… this is not about a 914 but is about our 1977 911S Targa 2.7L

Took her in to have a bad ground fixed that was blowing a fuse on the clock/lighter circuit. While being serviced we had an oil change done although it didn’t really need it. We had 10L’s of Motul 20/50 added and new filter.

While driving home I noticed that the oil pressure during throttle was almost pinned. When we got home (2 miles) the oil reading on the gauge at rest on level ground was just above the low line. This morning we moved it on the lift for winter storage and noticed a small puddle of oil, which never happens with this car. I cleaned the undercarriage and will see in the morning.


Any ideas?
User is online!Profile CardPM
Go to the top of the page
+Quote Post
 
 Reply to this topicStart new topic
Replies(1 - 15)
Bullethead
post Nov 23 2023, 06:58 PM
Post #2


Oil Cooled heart
***

Group: Members
Posts: 897
Joined: 24-June 10
From: South Florida
Member No.: 11,875
Region Association: South East States
Was the oil level checked with engine warm, thermostat open, idling on level ground? Ten liters including filter? Is the engine stock?

FWIW, I have a '67 911S and a '68 T and both show nearly zip oil pressure at idle when warm, but pressure rises appropriate to RPMs.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jett
post Nov 23 2023, 08:11 PM
Post #3


Senior Member
***

Group: Members
Posts: 1,640
Joined: 27-July 14
From: Seattle
Member No.: 17,686
Region Association: Pacific Northwest
QUOTE(Bullethead @ Nov 23 2023, 04:58 PM) *

Was the oil level checked with engine warm, thermostat open, idling on level ground? Ten liters including filter? Is the engine stock?

FWIW, I have a '67 911S and a '68 T and both show nearly zip oil pressure at idle when warm, but pressure rises appropriate to RPMs.


Yeah oil pressure rises during throttle but not pinning the gauge.

When measuring oil it was warm, at idle, and flat ground. Not sure how modified the 2.7 is but appears stock configuration.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Root_Werks
post Nov 23 2023, 08:18 PM
Post #4


Village Idiot
*****

Group: Members
Posts: 8,331
Joined: 25-May 04
From: About 5NM from Canada
Member No.: 2,105
Region Association: Pacific Northwest
20/50 seems pretty thick.

There are 1,000+ threads and opinions on oil. Do some research and change out the oil. My guess is pressure will return to normal with something a little lighter.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bkrantz
post Nov 23 2023, 08:25 PM
Post #5


914 Guru
*****

Group: Members
Posts: 7,792
Joined: 3-August 19
From: SW Colorado
Member No.: 23,343
Region Association: Rocky Mountains
QUOTE(Root_Werks @ Nov 23 2023, 07:18 PM) *

20/50 seems pretty thick.

There are 1,000+ threads and opinions on oil. Do some research and change out the oil. My guess is pressure will return to normal with something a little lighter.


Especially for winter season. It might take a long time for that oil to really get hot (and thin).
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Krieger
post Nov 23 2023, 09:09 PM
Post #6


Advanced Member
****

Group: Members
Posts: 4,723
Joined: 24-May 04
From: Santa Rosa CA
Member No.: 2,104
Region Association: None
I am wondering what they did to fix the ground on the clock. I think (not 100%) if you ground the oil pressure sender out (or the wire from the sender to the gage) it pins the gauge. Take it back in.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Jett
post Nov 23 2023, 10:23 PM
Post #7


Senior Member
***

Group: Members
Posts: 1,640
Joined: 27-July 14
From: Seattle
Member No.: 17,686
Region Association: Pacific Northwest
QUOTE(Krieger @ Nov 23 2023, 07:09 PM) *

I am wondering what they did to fix the ground on the clock. I think (not 100%) if you ground the oil pressure sender out (or the wire from the sender to the gage) it pins the gauge. Take it back in.

My mechanic is coming over on Tuesday.

The oil pressure goes down at idle but up at throttle , so the wiring should be ok.

The engine had 20/50 in it before but the temps havee changed.

… oil on the ground was overflow and/or blow off?
User is online!Profile CardPM
Go to the top of the page
+Quote Post
falcor75
post Nov 23 2023, 11:10 PM
Post #8


Senior Member
***

Group: Members
Posts: 1,579
Joined: 22-November 12
From: Sweden
Member No.: 15,176
Region Association: Scandinavia
The small puddle could it be spilled oil from the refill that made its way onto the ground overnight?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mlindner
post Nov 24 2023, 06:27 AM
Post #9


Senior Member
***

Group: Members
Posts: 1,526
Joined: 11-November 11
From: Merrimac, WI
Member No.: 13,770
Region Association: Upper MidWest
20/50 is the oil of choice on these older flat six engines.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rgalla9146
post Nov 24 2023, 07:17 AM
Post #10


Advanced Member
****

Group: Members
Posts: 4,563
Joined: 23-November 05
From: Paramus NJ
Member No.: 5,176
Region Association: None
QUOTE(mlindner @ Nov 24 2023, 07:27 AM) *

20/50 is the oil of choice on these older flat six engines.


I agree. Oil pressure light 'on' at idle is common as well.
Where under the engine ? front, rear, left or right ?
Could be spilled oil from the filter removal dripping from the engine tin.
Also, 10.5 qts. seems a bit high on an oil change.
You're doing the right thing. Better to be cautious.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jett
post Nov 24 2023, 11:20 AM
Post #11


Senior Member
***

Group: Members
Posts: 1,640
Joined: 27-July 14
From: Seattle
Member No.: 17,686
Region Association: Pacific Northwest
QUOTE(rgalla9146 @ Nov 24 2023, 05:17 AM) *

QUOTE(mlindner @ Nov 24 2023, 07:27 AM) *

20/50 is the oil of choice on these older flat six engines.


I agree. Oil pressure light 'on' at idle is common as well.
Where under the engine ? front, rear, left or right ?
Could be spilled oil from the filter removal dripping from the engine tin.
Also, 10.5 qts. seems a bit high on an oil change.
You're doing the right thing. Better to be cautious.

Thanks!

The oil was under the drain plug area and I see no signs of a higher up drip. No oil this morning, but the car has not been started.

My mechanic is an amazing practitioner and did the wiring fix, but probably had one of his helpers do the oil change. Regarding the oil amount, I am only referencing the bill that stated 10L of 20/50.

Thanks for all of the comments.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Jett
post Dec 1 2023, 06:38 PM
Post #12


Senior Member
***

Group: Members
Posts: 1,640
Joined: 27-July 14
From: Seattle
Member No.: 17,686
Region Association: Pacific Northwest
Turned out to be what some suspected…

1. Oil on ground caused by spillage during change.
2. Oil pressure increase was old oil versus new 20/50 + temp outside is cold.
3. Oil level was fine once we let the car sit to get up to temp (180 degrees).
User is online!Profile CardPM
Go to the top of the page
+Quote Post
930cabman
post Dec 2 2023, 07:41 AM
Post #13


Advanced Member
****

Group: Members
Posts: 3,130
Joined: 12-November 20
From: Buffalo
Member No.: 24,877
Region Association: North East States
All is well that ends well, your mechanic needs a different funnel
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jett
post Dec 2 2023, 08:51 AM
Post #14


Senior Member
***

Group: Members
Posts: 1,640
Joined: 27-July 14
From: Seattle
Member No.: 17,686
Region Association: Pacific Northwest
QUOTE(930cabman @ Dec 2 2023, 05:41 AM) *

All is well that ends well, your mechanic needs a different funnel

lol yeah, but he did come to my house to address, which was great.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
arbitrary
post Dec 2 2023, 12:31 PM
Post #15


Member
**

Group: Members
Posts: 81
Joined: 25-April 21
From: UK
Member No.: 25,475
Region Association: None
Make sure your gauge reading matches the dipstick reading….
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
porschetub
post Dec 2 2023, 01:40 PM
Post #16


Advanced Member
****

Group: Members
Posts: 4,703
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None
QUOTE(arbitrary @ Dec 3 2023, 06:31 AM) *

Make sure your gauge reading matches the dipstick reading….

Yes but they aren't known to be that accurate and require cleaning as the sender gunks up and don't read properly ,dipstick works pretty well however .
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 2nd June 2024 - 07:47 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...