Possible blown head gasket..

SlowE92 · 02-26-2024, 04:38 PM

As of yesterday my car had started overheating, gauge goes all the way to the right and limp mode. I checked the coolant reservoir and there was some oil inside of it. I checked the oil cap and did not see any coolant, however upon further inspection I noticed that there was dried up coolant underneath the intake manifold and on top of the HPFP, coating the engine, looks like it was spraying out at one point. I was thinking it was the oil filter housing gasket since where it sits its somewhat possible, but doesn't explain why the car is overheating. Before I take the head off the engine and replace it can anyone tell me anything else I can check? I looked through the forums and found some on this issue but none of them also stated that their car was overheating so If anyone has had anything similar happen I'm glad to take the advice. Also the water pump runs just fine.

335i54n · 02-26-2024, 07:18 PM

plug inspection, scope it and cylinder block test to verify

iqraceworks · 03-01-2024, 09:23 AM

Have you done a compression and leak-down test yet? If not, I would start there.

Eriksson042887 · 03-07-2024, 10:36 PM

It could explain the overheating. Best case scenario if there’s enough oil in the cooling system from a bad OFHG it could stop the coolant from doing its job. I don’t know about under the manifold though, can the OFHG leak from the back?

02-26-2024, 04:38 PM	#1
SlowE92 First Lieutenant 112 Rep 347 Posts Drives: E92 2007 335i, E60 2008 535xi Join Date: Sep 2023 Location: Salt Lake iTrader: (0)	Possible blown head gasket.. As of yesterday my car had started overheating, gauge goes all the way to the right and limp mode. I checked the coolant reservoir and there was some oil inside of it. I checked the oil cap and did not see any coolant, however upon further inspection I noticed that there was dried up coolant underneath the intake manifold and on top of the HPFP, coating the engine, looks like it was spraying out at one point. I was thinking it was the oil filter housing gasket since where it sits its somewhat possible, but doesn't explain why the car is overheating. Before I take the head off the engine and replace it can anyone tell me anything else I can check? I looked through the forums and found some on this issue but none of them also stated that their car was overheating so If anyone has had anything similar happen I'm glad to take the advice. Also the water pump runs just fine. __________________ 2007 E92 335i - MHD, Turbo Technics 19T's 2008 E60 535XI - JB4 2010 E92 335i - JB4, Borg Warner EFR 8374
	Appreciate 0 Tweet Quote

02-26-2024, 07:18 PM	#2
335i54n Lieutenant 295 Rep 525 Posts Drives: e90 335i, e39 m5 Join Date: Nov 2020 Location: socal iTrader: (0)	plug inspection, scope it and cylinder block test to verify
	Appreciate 0 Quote

03-01-2024, 09:23 AM	#3
iqraceworks Brigadier General 2001 Rep 3,731 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	Have you done a compression and leak-down test yet? If not, I would start there. __________________ 2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
	Appreciate 0 Quote

03-07-2024, 10:36 PM	#4
Eriksson042887 Enlisted Member 17 Rep 40 Posts Drives: 335i Join Date: Sep 2023 Location: Orangeville iTrader: (0)	It could explain the overheating. Best case scenario if there’s enough oil in the cooling system from a bad OFHG it could stop the coolant from doing its job. I don’t know about under the manifold though, can the OFHG leak from the back?
	Appreciate 0 Quote