986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Clunking sound, white smoke, overheated engine and coolant

Jake Raby · 02-16-2011, 05:26 AM

I have two cars here now that have this issue. One has a cracked cylinder, the other a cracked head- both recently had a water pump failure.

If your water pump failed and it was replaced, thats only 1/2 the replacement job. The debris removal from the broken impeller is CRUCIAL as it can circulate through the engine and cooling system. When this happens if debris blocks a cooling capillary inside one of the cylinder heads, the area will gain a hot pot and will crack. This occurs without any symptoms, no overheating and no temp elevation on the gauge.

Was the cooling system cleaned extensively?

These engines NEVER blow head gaskets (never seen a single one) and the heads WILL CRACK before a gasket blows!

02-16-2011, 05:26 AM	#7
Jake Raby Engine Surgeon Join Date: Aug 2008 Location: Cleveland GA USA Posts: 2,425	I have two cars here now that have this issue. One has a cracked cylinder, the other a cracked head- both recently had a water pump failure. If your water pump failed and it was replaced, thats only 1/2 the replacement job. The debris removal from the broken impeller is CRUCIAL as it can circulate through the engine and cooling system. When this happens if debris blocks a cooling capillary inside one of the cylinder heads, the area will gain a hot pot and will crack. This occurs without any symptoms, no overheating and no temp elevation on the gauge. Was the cooling system cleaned extensively? These engines NEVER blow head gaskets (never seen a single one) and the heads WILL CRACK before a gasket blows! __________________ Jake Raby/www.flat6innovations.com IMS Solution/ Faultless Tool Inventor US Patent 8,992,089 & US Patent 9,416,697 Developer of The IMS Retrofit Procedure- M96/ M97 Specialist Last edited by Jake Raby; 02-16-2011 at 05:30 AM.