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 )

 
 Reply to this topicStart new topic
> First start after rebuild, No oil pressure... Someone help me..please!
DavidSweden
post Apr 18 2015, 04:33 AM
Post #1


Member
**

Group: Members
Posts: 479
Joined: 8-June 14
From: Sweden
Member No.: 17,452
Region Association: Scandinavia
Engine 2.0 76
Rebuilt engine and should start it today. Pulled the plugs and filled oil. Cranked engine to get oil pressure but nothing. Pulled pressure switch and tested with compressed air works fine. Loosened oil filter and cranked again oil ran from filter, tightened filter and tried again.... Nothing.


Oil type 20W 50

Need some advice on what to check to find source or problem.... It's just a Pita
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
toolguy
post Apr 18 2015, 12:22 PM
Post #2


Senior Member
***

Group: Members
Posts: 1,270
Joined: 2-April 11
From: San Diego / El Cajon
Member No.: 12,889
Region Association: Southern California
You could pull a valve cover and see if oil has gotten up there. . If so, then you know the cam is lubricated and the crank should be also. .
Will make a mess but you can pull the oil pressure sender, crank as see if oil come out. .
How are you measuring oil pressure? to an idiot light or a gauge?
Might be that you have pressure but the indicator isn't working properly.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DavidSweden
post Apr 18 2015, 12:29 PM
Post #3


Member
**

Group: Members
Posts: 479
Joined: 8-June 14
From: Sweden
Member No.: 17,452
Region Association: Scandinavia
QUOTE(toolguy @ Apr 18 2015, 10:22 AM) *

You could pull a valve cover and see if oil has gotten up there. . If so, then you know the cam is lubricated and the crank should be also. .
Will make a mess but you can pull the oil pressure sender, crank as see if oil come out. .
How are you measuring oil pressure? to an idiot light or a gauge?
Might be that you have pressure but the indicator isn't working properly.



Pressure idiot light sender working ok. Removed idiot light sender and cranked engine some oil is coming up but its not exactly gushing.

Any ideas as what to do next?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Apr 18 2015, 12:44 PM
Post #4


914 Idiot
**********

Group: Members
Posts: 14,991
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
Did you pre-fill the filter with oil? If so, you may have hurt your cause. I have had success in that situation by using a turkey baster to squirt oil up into the pickup tube (yes, it's a mess!) to get enough in there to prime it.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Apr 18 2015, 12:57 PM
Post #5


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None
It seems to take forever for a fresh T4 to get oil pressure.

Was the oil cooler new? Are you sure the big oil pressure piston is in place?

It just occurred to me that 'pinning' the big oil pressure relief piston shut might improve oil filling time. High oil pressure will bleed off back to the sump... (IMG:style_emoticons/default/idea.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DavidSweden
post Apr 18 2015, 01:00 PM
Post #6


Member
**

Group: Members
Posts: 479
Joined: 8-June 14
From: Sweden
Member No.: 17,452
Region Association: Scandinavia
QUOTE(Dave_Darling @ Apr 18 2015, 10:44 AM) *

Did you pre-fill the filter with oil? If so, you may have hurt your cause. I have had success in that situation by using a turkey baster to squirt oil up into the pickup tube (yes, it's a mess!) to get enough in there to prime it.

--DD



Dave,

I did not pre-fill the filter. Which pick up tube are refering too (I am a newbie) do you mean one in sump?

I dont care about making a mess I just got to get this mother fired up!

Thanks
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DavidSweden
post Apr 18 2015, 01:07 PM
Post #7


Member
**

Group: Members
Posts: 479
Joined: 8-June 14
From: Sweden
Member No.: 17,452
Region Association: Scandinavia
QUOTE(McMark @ Apr 18 2015, 10:57 AM) *

It seems to take forever for a fresh T4 to get oil pressure.

Was the oil cooler new? Are you sure the big oil pressure piston is in place?

It just occurred to me that 'pinning' the big oil pressure relief piston shut might improve oil filling time. High oil pressure will bleed off back to the sump... (IMG:style_emoticons/default/idea.gif)


Yes the oil cooler is new. The piston moved freely when I installed it and I even installed the spring, joking aside I appreciate the help

What you mean is that the oil cold and at high pressure so is being diverted by the pressure piston and is therefore not building pressure under the idiot sender?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Apr 18 2015, 02:08 PM
Post #8


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None
It's a possibility. If you pull the big piston back out and use a length of rod in place of the spring, you can keep the oil from bypassing. The motor shouldn't run the way though. (IMG:style_emoticons/default/wink.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DavidSweden
post Apr 18 2015, 03:12 PM
Post #9


Member
**

Group: Members
Posts: 479
Joined: 8-June 14
From: Sweden
Member No.: 17,452
Region Association: Scandinavia
QUOTE(McMark @ Apr 18 2015, 12:08 PM) *

It's a possibility. If you pull the big piston back out and use a length of rod in place of the spring, you can keep the oil from bypassing. The motor shouldn't run the way though. (IMG:style_emoticons/default/wink.gif)


Sorry but I don't think this is right, if the pressure is high enough to open the bypass valve then the sender should show oil pressure. Check out the diagram from the WSM

Does anyone have any way to test if the pump is pumping oil att pressure?

(IMG:http://www.914world.com/bbs2/uploads_offsite/i1300.photobucket.com-17452-1429391927.1.jpg)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
McMark
post Apr 18 2015, 03:19 PM
Post #10


914 Freak!
***************

Group: Retired Admin
Posts: 20,179
Joined: 13-March 03
From: Grand Rapids, MI
Member No.: 419
Region Association: None
yeah, good point. (IMG:style_emoticons/default/sad.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Highland
post Apr 18 2015, 04:56 PM
Post #11


Senior Member
***

Group: Members
Posts: 513
Joined: 8-August 11
From: San Diego, CA
Member No.: 13,418
Region Association: Southern California
Just my 2 cents, but I couldn't build oil pressure with just the starter turning the motor. When I removed the oil pressure gage oil was in the boss so I figured oil was in the system since I did no priming.

Started the motor and oil pressure came to specified range immediately. I've started the motor twice and ran the cam break in procedure, but have yet to install, so the verdict is still out on my engine:)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DavidSweden
post Apr 19 2015, 01:34 AM
Post #12


Member
**

Group: Members
Posts: 479
Joined: 8-June 14
From: Sweden
Member No.: 17,452
Region Association: Scandinavia
QUOTE(Highland @ Apr 18 2015, 02:56 PM) *

Just my 2 cents, but I couldn't build oil pressure with just the starter turning the motor. When I removed the oil pressure gage oil was in the boss so I figured oil was in the system since I did no priming.

Started the motor and oil pressure came to specified range immediately. I've started the motor twice and ran the cam break in procedure, but have yet to install, so the verdict is still out on my engine:)


Thanks Highlander,

If there are no more ideas from members as what to do then I will probably go that route.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rick 918-S
post Apr 19 2015, 03:03 PM
Post #13


Hey nice rack! -Celette
***************

Group: Members
Posts: 20,492
Joined: 30-December 02
From: Now in Superior WI
Member No.: 43
Region Association: Northstar Region
I would fire it for a second. Then Pull the coil wire and see if the light goes out when cranking it with the starter. Is your battery fully charged? Engine cranking normally?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DavidSweden
post Apr 19 2015, 04:12 PM
Post #14


Member
**

Group: Members
Posts: 479
Joined: 8-June 14
From: Sweden
Member No.: 17,452
Region Association: Scandinavia
QUOTE(rick 918-S @ Apr 19 2015, 01:03 PM) *

I would fire it for a second. Then Pull the coil wire and see if the light goes out when cranking it with the starter. Is your battery fully charged? Engine cranking normally?


The light goes out when the wire is pulled. I have put the battery on charge. There is oil in the gallery so I guess the pump is working. I will see if I can get pressure with a fresh battery. I may just throw caution to the wind and fire it up, I don't really see what my other options are? As you will understand I am a bit anxious as I have been rebuilding the engine since september and have put a lot of work and $ into it. The thought of it seizing is just too much.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Apr 19 2015, 05:15 PM
Post #15


Engine Surgeon
*****

Group: Members
Posts: 9,394
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
Fire up and shut down 5 times in succession. Let it run less than 1 second and shut it off.

I always pack the oil pump full of vaseline when assembling and the engine will usually get OP in 5 seconds.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Al Meredith
post Apr 19 2015, 05:56 PM
Post #16


Senior Member
***

Group: Members
Posts: 960
Joined: 4-November 04
From: Atlanta, ga
Member No.: 3,061
I build 2 engines a year and start them on an engine stand outside the car. I always install a direct reading oil pressure guage. I crank them on the starter with the plugs out. I 1/2 fill the oil filter and sometime I can't get any pressure so I remove the filter and let some oil run out of the filter housing under cranking . Then reinstall the filter , crank the engine and I usually get 40 + PSI with the plugs out. It takes a while to fill the valve assembly. Best advise is to listen to Jake.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Geezer914
post Apr 20 2015, 08:38 AM
Post #17


Geezer914
***

Group: Members
Posts: 1,444
Joined: 18-March 09
From: Salem, NJ
Member No.: 10,179
Region Association: North East States
Why is it recommended NOT to fill the oil filter when trying to build up oil pressure??? (IMG:style_emoticons/default/confused24.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
stugray
post Apr 20 2015, 09:54 AM
Post #18


Advanced Member
****

Group: Members
Posts: 3,825
Joined: 17-September 09
From: Longmont, CO
Member No.: 10,819
Region Association: None
QUOTE(Geezer914 @ Apr 20 2015, 08:38 AM) *

Why is it recommended NOT to fill the oil filter when trying to build up oil pressure??? (IMG:style_emoticons/default/confused24.gif)


To prime this system, the pump needs to pull oil up from the sump.
While it is doing this (for the very first time) the pump only has air to use as the "pumping medium".
This is why it takes so long to prime.

IF you are asking the pump to prime itself WHILE trying to push oil OUT of the filter, it will take longer.
I think the best idea is to leave the filter off, and prime till oil is coming out of the filter bracket.
Then you can put the filter on (ful OR empty) and continue to prime until you get pressure.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DavidSweden
post Apr 20 2015, 10:51 AM
Post #19


Member
**

Group: Members
Posts: 479
Joined: 8-June 14
From: Sweden
Member No.: 17,452
Region Association: Scandinavia
Thanks to everyone for helping me out I appreciate it. I will let you know how it goes.
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: Standard · Switch to: Linear+ · Switch to: Outline

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

- Lo-Fi Version Time is now: 8th June 2024 - 10:48 PM
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 ...