Notices
Boxster & Boxster S (986) Forum
Sponsored by:
Sponsored by:

Yet another water pump with metal impeller story...

 
Old 03-14-2019, 08:10 PM
  #1  
tt9714
User
Thread Starter
 
Join Date: Nov 2001
Location: Silicon Valley, CA
Posts: 418
Default Yet another water pump with metal impeller story...

Documentation on why a water pump with metal impeller can cause irreversible damage.

This is a subset of my ongoing thread: "What's my next move?"
https://rennlist.com/forums/boxster-and-boxster-s-986-forum/1126901-what-is-my-next-move-4.html

Photos below show comparisons of:
  • LEFT: original block / genuine Porsche water pump (plastic impeller); 28K miles
  • RIGHT: replacement block from engine swap / aftermarket water pump (metal impeller); mileage unknown

Besides the coolant gelling problem (green + orange = gel) you can see the damage to the block on the right.
I measured both original & replacement block and average difference is (0.31) mm between replacement & original.

Now I have to make a decision:
  • Choice 1: take my chances with swap engine (risk from gelled coolant & risk from case damage)
  • Choice 2: return engine to seller, absorb $450-500 return shipping fee, and look for another engine


LEFT: genuine Porsche; RIGHT: aftermarket with metal impeller AND gel

LEFT: genuine Porsche; RIGHT: aftermarket with metal impeller

LEFT: genuine Porsche; RIGHT: aftermarket with metal impeller
tt9714 is offline  
Old 03-14-2019, 11:14 PM
  #2  
Brian in Tucson
User
 
Join Date: Jan 2018
Posts: 209
Default

Have you run this by the seller? That damage is not good. Might be okay with a proper water pump, but would you be satisfied?

How far away is the seller from the south bay?
Brian in Tucson is offline  
Old 03-15-2019, 10:13 PM
  #3  
AnthonyGS
Addict
Rennlist Member
 
AnthonyGS's Avatar
 
Join Date: Feb 2017
Location: Dallas, TX
Posts: 587
Default

That is terrible. Sorry to see the damage to your block.

AnthonyGS is offline  
Old 03-22-2019, 06:35 PM
  #4  
Porschetech3
User
 
Porschetech3's Avatar
 
Join Date: Oct 2010
Location: Alabama USA
Posts: 1,187
Default

My .02 cents/ opinions.

The Porsche green/pink(orange) coolant is compatible/mixable and will not gel. Other formulas maybe, but Dexcool is known to be the most recognized offender.

I would be suspicious of an intermix of oil causing the gel/mayonnaise gel like substance, from either a previous or present intermix condition.

That engine should be carefully evaluated or returned. Surely I would expect the seller, if a business with a warranty, to pay for return.

If you are stuck with the engine, I would carefully evaluate for an intermix condition. Then after conclusion, look to the water pump efficiency issue.

If the block wear/score is smooth and not grooved and only 0.31mm deep, I would measure the gasket thickness. Use a 0.31mm THINNER gasket or sealer to restore the water pump efficiency back to factory specs. Note : carefully bolt the WP back on the block and rotate by hand to ensure no contact of the impeller to block. Hope this helps..
Porschetech3 is offline  
Old 03-23-2019, 04:18 PM
  #5  
Charles Navarro
Addict
Rennlist Member
 
Charles Navarro's Avatar
 
Join Date: Mar 2002
Location: Momence, IL
Posts: 1,011
Default

I'd return it. I also don't like that whoever was working on the used engine copper-coated the water pump gasket. Makes me think they re-used it and question what else was done to that engine. The returned shipping cost might be the lesser evil.
Charles Navarro is offline  
Old 03-23-2019, 04:33 PM
  #6  
Brian in Tucson
User
 
Join Date: Jan 2018
Posts: 209
Default

Originally Posted by Charles Navarro View Post
I'd return it. I also don't like that whoever was working on the used engine copper-coated the water pump gasket. Makes me think they re-used it and question what else was done to that engine. The returned shipping cost might be the lesser evil.
I agree.

Brian in Tucson is offline  

Thread Tools
Search this Thread

Contact Us - About Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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 Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: