First startup after engine rebuild procedure? - Rennlist - Porsche Discussion Forums


First startup after engine rebuild procedure?


Old 11-20-2017, 12:36 PM
Thread Starter
Join Date: Oct 2016
Posts: 79
Default First startup after engine rebuild procedure?

Alright, so after about a year of work, I've just about finished my engine rebuild and installation. Having never rebuilt an engine previously, what all do I need to just before I start the engine up? I've read some generic posts about priming the oil pump, or putting some oil or whatever through the spark plug holes and filling the block with coolant directly (Heater core is what was mentioned), but I've not come across anything specific to our 2.5L engines.
So what's the process? My block is sitting dry but I'm putting fluids in it later today or tomorrow
dreygata is offline  
Reply With Quote
Old 11-20-2017, 02:24 PM
Rennlist Member
V2Rocket's Avatar
Join Date: Jan 2007
Location: Alta Loma, CA
Posts: 40,107

some folks like to pour oil down the oil filter holes (with filter removed) to try to "pre-fill" the passages with oil...if there's already oil in the passages, when the pump kicks in and starts making pressure, it'll be less time until the full engine has oil pressure/flow since there's already oil in the system.

i like to pull either/both the wire from ign. coil to distributor and/or the fuel pump fuse and use the starter to crank over the engine for 10-15 seconds at a time to get oil pumping. then reconnect to fire.

coolant...just fill the coolant tank, on a 944 8-valve the coolant goes from the tank to the passenger side of the radiator, youll have to keep topping off as it gets sucked down. eventually the radiator will be full and it'll start to fill up the lower rad hose, up to the pump and into the block a little. a little messy cheat trick is to remove the upper radiator hose and pour coolant/water down the coolant outlet neck - this will "pre-fill" the head and block with coolant, just fill it until you can see coolant coming up the neck and then re-connect the upper hose so none leaks out.

put the front of the car up 12" or more if you can, open the heater valve to max, leave the coolant tank cap off and run the car, just let it idle is fine, keep topping off the coolant tank as it gets sucked down more. as the temperature starts to come up, crack the 12 or 13mm head bleeder screw on that coolant outlet neck (upper rad hose connection) and let the steam out. just keep running the car and adding coolant until a steady stream of coolant starts coming out that screw, then close it and wipe up the leaked coolant, engine should be bled fine at that point.
V2Rocket is online now  
Reply With Quote

Related Topics
Thread Starter
Last Post
911 Forum
09-27-2017 02:45 PM
924, 924S and 931 Forum
06-04-2017 03:40 PM
944 Turbo and Turbo-S Forum
10-17-2016 12:09 PM
924/931/944/951/968 Forum
10-10-2016 03:35 PM
928 Forum
09-29-2016 05:07 PM

Thread Tools
Search this Thread
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -3. The time now is 07:13 PM.

Copyright ę 1998 - 2017 We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: