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Brown scum on surface of coolant following rebuild

A

Armagreggon85

Silverstone
Joined
4 Jan 2017
Messages
104
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
 
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
 
I'm guessing its just excess gasket sealant. They'll probs recommend flushing out and filling with fresh coolant.
 
Armagreggon85 said:
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
Click to expand...

:agree:

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

Good luck sorting it :thumb:
 
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.
 
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.
 
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 .
 
HSC911 said:
Armagreggon85 said:
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
Click to expand...

:agree:

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

Good luck sorting it :thumb:
Click to expand...

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 :D

I will monitor the situation
 
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