Sealing up the oil cooler block-off plate once and for all? (2024)

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  • Dec 18, 2023
  • #1

Geotrash

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Hi All,

I have tried 2 different gasket designs now, installed correctly per the manufacturer's instructions, torqued properly, and cannot get the oil cooler block-off plate to quit leaking on my '07. It's driving me crazy and it's getting worse as it's blowing back and dripping off the front differential now.

There are some billet covers out there and I bought one but the screws they shipped with it are too short, so I'm concerned that it will strip the aluminum threads if I try to use it. I could try longer bolts of course but I want to check with y'all first to see if any of you have found the ultimate solution here.

  • Dec 18, 2023
  • #2

OR VietVet

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Geotrash said:

Hi All,

I have tried 2 different gasket designs now, installed correctly per the manufacturer's instructions, torqued properly, and cannot get the oil cooler block-off plate to quit leaking on my '07. It's driving me crazy and it's getting worse as it's blowing back and dripping off the front differential now.

There are some billet covers out there and I bought one but the screws they shipped with it are too short, so I'm concerned that it will strip the aluminum threads if I try to use it. I could try longer bolts of course but I want to check with y'all first to see if any of you have found the ultimate solution here.

View attachment 416787

I ran into same problem. I did stop the leak with the billet plate and mine came with long enough screws. It was 3-4 years ago and cannot remember the exact plate but I think it was this one: https://www.amazon.com/Pressure-Rel...cooler+block+off+plate+for+5.3,aps,179&sr=8-7

  • Dec 18, 2023
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Geotrash

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OR VietVet said:

I ran into same problem. I did stop the leak with the billet plate and mine came with long enough screws. It was 3-4 years ago and cannot remember the exact plate but I think it was this one: https://www.amazon.com/Pressure-Relocation-Adapter-M16-1-5-Sending/dp/B00NY4VJL8/ref=sr_1_7?crid=1855KQTXRXS19&keywords=billet+oil+cooler+block+off+plate+for+5.3&qid=1702915658&sprefix=billet+oil+cooler+block+off+plate+for+5.3,aps,179&sr=8-7

Thanks Ron. I'll give that one a try and see how it goes!

  • Dec 18, 2023
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OR VietVet

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Geotrash said:

Thanks Ron. I'll give that one a try and see how it goes!

Make completely sure the sealing surfaces are completely clean and dry. Use a film of grease lube on the o-ring.

  • Dec 18, 2023
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iamdub

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Geotrash said:

Thanks Ron. I'll give that one a try and see how it goes!

I used the same one Ron linked you to. I only had it about 1.5-2 years but I subjected it to 70+ PSI many times. I gave it to my buddy when I installed an engine oil cooler and he's been running it for about a year now with no problems. He even reused the O-ring.

Growing up doesn't have to suck

I have the high lift version of that cam in my 6.0 and it sounds basically stock even with long tubes and full dual 3" exhaust. Granted it has a massive flopro mufler and "highflow" cats. A buddy has that exact cam in his 2002 5.3 with stock heads and swears hes never driven a more "peppy"...

Sealing up the oil cooler block-off plate once and for all? (7)www.tahoeyukonforum.com

  • Dec 18, 2023
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Geotrash

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iamdub said:

I used the same one Ron linked you to. I only had it about 1.5-2 years but I subjected it to 70+ PSI many times. I gave it to my buddy when I installed an engine oil cooler and he's been running it for about a year now with no problems. He even reused the O-ring.

Growing up doesn't have to suck

I have the high lift version of that cam in my 6.0 and it sounds basically stock even with long tubes and full dual 3" exhaust. Granted it has a massive flopro mufler and "highflow" cats. A buddy has that exact cam in his 2002 5.3 with stock heads and swears hes never driven a more "peppy"...

Sealing up the oil cooler block-off plate once and for all? (9)www.tahoeyukonforum.com

Thank you, Chris. Fingers crossed!

  • Dec 19, 2023
  • #7

Dustin Jackson

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I hope the block off plate fixes it, in theory it is the same kind of seal even with the block off plate.

I deleted the oil cooling system from my 94 k1500 and have increased oil pressure and no more oil leaks. My 08 Tahoe never had an oil cooler from the factory

  • Dec 19, 2023
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OR VietVet

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The billet block will not warp and the old plate likely has.

  • Dec 19, 2023
  • #9

donjetman

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Mid September I removed my bypass filter setup and reinstalled the stock oil cooler block-off plate & bolts with Felpro # 72435 gasket with a thin coat of RectorSeal T+2 on the gasket. No leak.

  • Dec 25, 2023
  • #10

PatDTN

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I used a bullet plate that provided a passage between the hole for the lines. I figure it mimics having a cooler. Mine had a silicone gasket attached to the plate. I don't think mine is leaking but I should probably take a fresh look at it.

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Sealing up the oil cooler block-off plate once and for all? (2024)

FAQs

Can a blocked oil cooler cause low oil pressure? ›

That said, oil coolers rarely clog. The most common reasons for low oil pressure is the bearing are worn out or oil level is low. Other possible causes are the bypass valve is stuck open, a significant amount of water in the oil, worn oil pump, bad oil pickup, blown oil pump gasket.

Can a clogged oil cooler cause overheating? ›

Car Overheating

If the oil cooler is damaged, it may not be able to do this effectively, causing the engine to overheat. This can lead to a range of problems, including decreased performance, increased wear and tear on engine components, and in extreme cases, engine failure.

What is an oil cooler seal? ›

An oil cooler gasket is a component that seals the connection between the oil cooler and the engine block. The oil cooler is a device that lowers the temperature of the oil that circulates through the engine, preventing overheating and damage.

Can you drive a car with a leaking oil cooler? ›

Although it's technically possible to drive with a bad oil cooler, we would strongly advise against it. Bad oil coolers are ticking time bombs that can wreak havoc on your engine and potentially cause it to stop.

What are the common symptoms of failing an oil cooler? ›

If the oil cooler fails, it can cause warning lights to illuminate on the dashboard. These can include the check engine light, the oil pressure warning light, and the engine temperature warning light. If you see any warning lights on your dashboard, you ask an experienced mechanic to inspect your car.

How to tell if an oil cooler line is bad? ›

Issues with the oil cooling line will disrupt the engine cooling process. Symptoms of a bad oil cooler line include low engine oil levels, engine oil puddling beneath your vehicle, and damaged metal lines. The oil cooler line will need to be replaced at least once before the 100,000-mile mark.

What causes an engine oil cooler to fail? ›

An engine oil cooler should last for years with minimal problems. Some of the most common problems are cracks and leaks in the cooler. Rust often causes leaks, but road vibrations can also contribute to this problem, especially if you drive off-road. Generally, this problem is more likely to occur in an older vehicle.

Can a leaking oil cooler be repaired? ›

The Industry Standard for repairing old, leaking oil coolers used to be epoxy applied directly to the area of the leak (although at Pacific Oil Cooler Service, Inc., we have never used epoxy to repair a leaking oil cooler – we perform all repairs using only an appropriate Inert-Gas type weld).

What fluid runs through an oil cooler? ›

Oil cooling is the use of engine oil as a coolant, typically to remove surplus heat from an internal combustion engine. The hot engine transfers heat to the oil which then usually passes through a heat-exchanger, typically a type of radiator known as an oil cooler.

Does a oil cooler need a gasket? ›

Furthermore, oil cooler gaskets play a crucial role in preventing contamination of engine oil or coolant, which can lead to corrosion, buildup of debris, and ultimately, engine failure. Their resilience and durability contribute to the overall reliability of the engine, reducing the risk of costly repairs and downtime.

Does oil cooler affect transmission? ›

A malfunctioning transmission oil cooler can lead to irregularities in the transmission system's operation. If you experience delayed shifting, or other gear shifting issues, it may be a sign of inadequate cooling and lubrication.

What happens if an oil cooler gasket fails? ›

Another potential symptom of an oil cooler gasket failure is oil contamination. If coolant or water compromises the integrity of the engine oil, then the oil is rendered ineffective—in fact, it can cause significant engine damage that can be irreparable.

How much does it cost to fix an oil cooler leak? ›

The average cost for an Engine Oil Cooler Replacement is between $562 and $613. Labor costs are estimated between $161 and $203 while parts are priced between $401 and $410. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.

What is most likely to cause low oil pressure? ›

Oil Level Is Too Low

The oil level dropping below the minimum dipstick line is one of the most common causes of low oil pressure. This can happen at any time, even if you've recently had an oil change. Over time, engines burn oil more quickly. This is due to piston rings wearing, seals leaking, and so on.

Why is my oil pressure low if I have enough oil? ›

If the oil level on the dipstick is between “add” and “full” but the engine is running noisily, the oil pump may be worn. A worn pump is unable to generate the necessary pressure due to internal leaks. Stop the engine until the issue can be fixed. A pump replacement will be needed.

What all can cause low oil pressure? ›

The top five causes of low oil pressure include:
  • Insufficient Oil in the Engine. The low oil pressure warning beeps quickly whenever the oil drops below the minimum dipstick level. ...
  • Poor Oil Viscosity. ...
  • Engine Wear. ...
  • Oil Pump Failure. ...
  • Dirty or Clogged Oil Filter.
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