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Old 03-02-2018, 09:45 AM   #1
DWester
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Default Oil on radiator??

We just bought this 31 A coupe and noticed the oil at the lower end of the radiator. It doesn't appear that there's any oil leaks up front to cause this. Has anyone experienced this before?
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Old 03-02-2018, 10:01 AM   #2
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Default Re: Oil on radiator??

And your SURE its oil? Coolant leaks get sticky with time and can seem like oil.

Theres no logical reason i can think of why that big of an oil leak would show up there short of someone accidently knocking over an oil bottle.
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Old 03-02-2018, 10:04 AM   #3
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Default Re: Oil on radiator??

Wash it off w/detergent and see if it re-appears.
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Old 03-02-2018, 10:16 AM   #4
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Default Re: Oil on radiator??

Probably not oil but water with antifreeze.
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Old 03-02-2018, 10:19 AM   #5
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Default Re: Oil on radiator??

If someone has over greased the rear water pump zerk the oil from the grease plus coolant can cause this. I have seen so many radiators that are full of grease from this. The rear pump zerk should get just a little grease maybe once a year. Open the cap and you may find that the extra grease will accumulate around the filler neck and the overflow.
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Old 03-02-2018, 10:21 AM   #6
Dan Partain
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Default Re: Oil on radiator??

If you run the engine without the timing pin it will spit out oil that can get on the bottom of the radiator.
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Old 03-02-2018, 10:22 AM   #7
BILL WILLIAMSON
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Default Re: Oil on radiator??

Quote:
Originally Posted by katy View Post
Wash it off w/detergent and see if it re-appears.
Katy,
Spray 409 or Fantastic on a wide paint brush & run the bristles across through the fins & it cleans it nice & easy. No hosing needed.
Bill W.
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Old 03-02-2018, 10:26 AM   #8
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Default Re: Oil on radiator??

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Originally Posted by SeaSlugs View Post
And your SURE its oil? Coolant leaks get sticky with time and can seem like oil.

Theres no logical reason i can think of why that big of an oil leak would show up there short of someone accidently knocking over an oil bottle.
That was our thinking, but having never owned one of these before, I decided to ask you guys. I'll take a good look at the rear zerk/grease also and see if it's contributing. Thanks you guys!!
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Old 03-02-2018, 10:39 AM   #9
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Default Re: Oil on radiator??

Quote:
Originally Posted by Dan Partain View Post
If you run the engine without the timing pin it will spit out oil that can get on the bottom of the radiator.
Interesting. Thanks
Quote:
Originally Posted by BILL WILLIAMSON View Post
Katy,
Spray 409 or Fantastic on a wide paint brush & run the bristles across through the fins & it cleans it nice & easy. No hosing needed.
Bill W.
I've got Fantastic and will give it a try. Thanks!!
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Old 03-02-2018, 10:53 AM   #10
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Default Re: Oil on radiator??

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Originally Posted by 3.6rs View Post
Probably not oil but water with antifreeze.
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Old 03-02-2018, 11:42 AM   #11
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Default Re: Oil on radiator??

Quote:
Originally Posted by Dan Partain View Post
If you run the engine without the timing pin it will spit out oil that can get on the bottom of the radiator.
oooh good point. about the right height for that. Does your wisdom come from experience?
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Old 03-02-2018, 12:27 PM   #12
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Default Re: Oil on radiator??

Yes, Some things we learn the hard way, LOL!
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Old 03-02-2018, 05:19 PM   #13
BILL WILLIAMSON
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Default Re: Oil on radiator??

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Originally Posted by DWester View Post
Interesting. Thanks


I've got Fantastic and will give it a try. Thanks!!
We not only have Fantastic, but The Dog & I are "FANTASTIC"--- Just ask us----LOL
Bill W. & Buster T.
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Old 03-02-2018, 05:51 PM   #14
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Default Re: Oil on radiator??

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Yes, Some things we learn the hard way, LOL!
Very nice looking car. Enjoy.
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Old 03-03-2018, 02:09 AM   #15
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Default Re: Oil on radiator??

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Originally Posted by Dan Partain View Post
If you run the engine without the timing pin it will spit out oil that can get on the bottom of the radiator.


Yep, it happened to me once, and I'd bet that's what happened here.


When I bought my 28, it had a wet spot on the top right of the radiator. I used a radiator sealant like Bars Leak or something like that, and it's been dry for the past 18 years.
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Old 03-03-2018, 09:46 AM   #16
BILL WILLIAMSON
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Default Re: Oil on radiator??

Sometimes stains like that come from Folks that use Soluable Oil for a rust inhibitor & "maybe" it boiled over at one time. Seems that stains like that are fairly common.
I've even seen CARS for SALE, with stains like that. I've also seen them, with PUDDLES under them!!!!
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Old 03-04-2018, 07:05 PM   #17
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Default Re: Oil on radiator??

Could be..... someone added soluble oil to radiator water instead of antifreeze. This is what in the old days was called water pump lubricant.
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