Coolant + oil leak on oil pan. Source ideas?
#1
03-22-2019, 06:25 PM
Coolant + oil leak on oil pan. Source ideas?
Hey blazer boys, I’m planning on taking my blazer on a 5,000km roadtrip in a week. Its always leaked some golden coloured oil underneath the oil pan. Today I checked and its bright orange. Meaning the gold oil was mostlikely a 30/70 oil to coolant split and now it seems like a lot more coolant than oil.
i was ok with the oil leak, seemed to be consistent enough. This coolant leak worries me. Cant find any source on top, can only follow the drips up the side. Rad seems pretty clean. I’m banking on it being the intake manifold gasket. Which ill need to start doing now if I want to have it all properly put together in time for the trip.
Last edited by RedBlezer; 03-22-2019 at 06:42 PM.
#4
03-23-2019, 11:17 AM
If there is no other source for the coolant leak and the coolant has started to drop, it could very well be the lower intake manifold gaskets.
A concern would be that if you have already had coolant in the engine oil that your main bearings could be damaged.
I have read that if your oil is full synthetic that perhaps little damage might have been done. This would be because the water could mix differently with the coolant.
What color is your oil?
A concern would be that if you have already had coolant in the engine oil that your main bearings could be damaged.
I have read that if your oil is full synthetic that perhaps little damage might have been done. This would be because the water could mix differently with the coolant.
What color is your oil?
#5
03-23-2019, 03:43 PM
If there is no other source for the coolant leak and the coolant has started to drop, it could very well be the lower intake manifold gaskets.
A concern would be that if you have already had coolant in the engine oil that your main bearings could be damaged.
I have read that if your oil is full synthetic that perhaps little damage might have been done. This would be because the water could mix differently with the coolant.
What color is your oil?
A concern would be that if you have already had coolant in the engine oil that your main bearings could be damaged.
I have read that if your oil is full synthetic that perhaps little damage might have been done. This would be because the water could mix differently with the coolant.
What color is your oil?
#6
03-23-2019, 06:02 PM
There is a possibility that it is not the gaskets but rather a leaky hose. I heard of one guy's who had a heater hose that had a pin-hole in it.
Have you driven or run it since the oil change? What does the oil look like? When there is a catastrophic leak, reports are that the oil and coolant will mix turning into something that looks like chocolate milk. If you don't have that, then either the leak into the lifter valley is not bad or the coolant is leaking elsewhere.
#7
03-23-2019, 07:51 PM
There are a lot of threads on changing out the LIM gaskets. I did it as soon as I learned about how they can fail.
There is a possibility that it is not the gaskets but rather a leaky hose. I heard of one guy's who had a heater hose that had a pin-hole in it.
Have you driven or run it since the oil change? What does the oil look like? When there is a catastrophic leak, reports are that the oil and coolant will mix turning into something that looks like chocolate milk. If you don't have that, then either the leak into the lifter valley is not bad or the coolant is leaking elsewhere.
There is a possibility that it is not the gaskets but rather a leaky hose. I heard of one guy's who had a heater hose that had a pin-hole in it.
Have you driven or run it since the oil change? What does the oil look like? When there is a catastrophic leak, reports are that the oil and coolant will mix turning into something that looks like chocolate milk. If you don't have that, then either the leak into the lifter valley is not bad or the coolant is leaking elsewhere.
#8
03-23-2019, 11:59 PM
oil still looks clean, definitely no choco milk I know exactly what you’re talking about. Does the coolant have to leak through the oil to leak out the LIM? I hope its a hose. Ill probably have the block and coolant pressure tested asap so I can at least know where the source is
When I replaced my LIM gaskets, I thought I could see where the plastic frame/carrier for the gasket was starting to fail. If/when you replace them on yours, be sure to use good RTV on the front and back block rails as I think I have a small oil leak from the front of mine where I could have sealed it better.
#9
03-24-2019, 05:06 PM
Like you both already mentioned, it's probably the LIM gasket, but I've seen leaking from the freeze plugs, too. Also, if you're going to change the LIM gaskets, you might as well do the valve cover gaskets at the same time.
#10
03-24-2019, 07:14 PM
Ditto on the valve cover gaskets. The FelPro kit with the better metal framed LIM gaskets includes the valve cover gaskets too. I went ahead and purchased new LIM bolts. too.
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