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Armagreggon85
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Joined: 04 Jan 2017
Posts: 82



PostPosted: Wed Nov 28, 2018 11:53 pm    Post subject: Brown scum on surface of coolant following rebuild Reply with quote

I've recently had my 3.4 engine rebuilt by hartech following an ims failure. I kept the cost down by removing and recording the engine myself - a full write up is in the pipeline so hopefully I'll be able to share my experiences in the not too distant future.

Luckily for me after refitting the engine it fired up fine with no leaks, oil pressure and water temps all good. Following the running in procedure I'm up to about 130 miles - as mentioned all has gone smoothly. However having recently checked the coolant there was a light layer of brown scum on the surface which was easily wiped off with a tissue.

Is this something that one should expect after a rebuild? Could there be contamination from any assembly lube? The coolant was drained and refilled so could have pulled some crap through the system. Interested to hear if anyone experienced similar.

Greg
 
  
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HSC911
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Joined: 23 Jul 2014
Posts: 5731
Location: Bedford


PostPosted: Thu Nov 29, 2018 12:25 am    Post subject: Reply with quote

Why don't you ask Hartech Dont know
 
  
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Armagreggon85
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Joined: 04 Jan 2017
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PostPosted: Thu Nov 29, 2018 1:07 am    Post subject: Reply with quote

I have also pinged Hartech an email as well, just awaiting a response. I am curious to hear if anyone else had experienced this.

Since this is a specialist Porsche website with lots of knowledgeable and experienced members who like to talk about their cars I often learn a lot from these forums. I could just speak to Hartech and crack on but in the spirit of things It's nice to get information from a variety of sources and discuss the issues with fellow enthusiasts
 
  
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alex yates
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Brands Hatch


Joined: 06 Mar 2014
Posts: 14490
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 29, 2018 6:50 am    Post subject: Reply with quote

I'm guessing its just excess gasket sealant. They'll probs recommend flushing out and filling with fresh coolant.
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HSC911
Zolder


Joined: 23 Jul 2014
Posts: 5731
Location: Bedford


PostPosted: Thu Nov 29, 2018 9:33 am    Post subject: Reply with quote

Armagreggon85 wrote:
I have also pinged Hartech an email as well, just awaiting a response. I am curious to hear if anyone else had experienced this.

Since this is a specialist Porsche website with lots of knowledgeable and experienced members who like to talk about their cars I often learn a lot from these forums. I could just speak to Hartech and crack on but in the spirit of things It's nice to get information from a variety of sources and discuss the issues with fellow enthusiasts


Agree

Reading back, I hope I didn't sound like a gear 'knob' Grin

Good luck sorting it Thumb
 
  
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Robertb
Long Beach


Joined: 01 Sep 2003
Posts: 6723
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Thu Nov 29, 2018 9:51 am    Post subject: Reply with quote

Hartech say in their t and c’s that some fallout in the oil is normal at the early stages, maybe the same with the coolant.
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maldren
Österreich


Joined: 07 Oct 2016
Posts: 942



PostPosted: Thu Nov 29, 2018 10:06 am    Post subject: Reply with quote

Your cooling system has been in use for 15-20 years so it won't be immaculate inside. I recently put in a LTT and there was sludge in the system, but I think someone had used one of those leak sealing solutions at some stage. I ran clean water through the car for some time until it ran clear before refilling and it's been fine ever since.

What was the coolant you drained out like? Unless you rinsed it out, I would expect a small amount of 'muck' in a system that had been rebuilt. Keep an eye on it.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5563
Location: Brighton


PostPosted: Thu Nov 29, 2018 8:32 pm    Post subject: Reply with quote

Drive it and monitor it .. if it continues then oil cooler is a possibility .. thats not something an engine rebuild would address ( we only fix what we can see or know about ).. there are other issues which again would not normally be seen on a rebuild but ..

For now keep an eye on it and see if its an actuall problem .
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Armagreggon85
Trainee


Joined: 04 Jan 2017
Posts: 82



PostPosted: Fri Nov 30, 2018 8:07 pm    Post subject: Reply with quote

HSC911 wrote:
Armagreggon85 wrote:
I have also pinged Hartech an email as well, just awaiting a response. I am curious to hear if anyone else had experienced this.

Since this is a specialist Porsche website with lots of knowledgeable and experienced members who like to talk about their cars I often learn a lot from these forums. I could just speak to Hartech and crack on but in the spirit of things It's nice to get information from a variety of sources and discuss the issues with fellow enthusiasts


Agree

Reading back, I hope I didn't sound like a gear 'knob' Grin

Good luck sorting it Thumb


Not at all, speaking to Hartech is an entirely sensible suggestion given they rebuilt the engine.

I had a chat with Grant at Hartech and essentially he said the same as you did deMort - just continue to use it monitor it.

Hopefully it will be just a one off. I did put a new oil cooler on the engine but I could of course have done a poor job of fitting it Very Happy

I will monitor the situation
 
  
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