Q: Rod Knock

asked by on

I purchased an extended warranty when I bought my vehicle (5 years/100,000 miles). On 10/26/16 the car made a loud knocking noise when started. I surmised a blown rod. I had it towed to my mechanic who confirmed this. I contacted my service contract company to file a claim. They have had my mechanic break the engine down and take pics and send to them, send them a video of the sound and also have sent out a 3rd party appraisal to find "the point of failure". They are now claiming they still cannot confirm this is whats wrong with the car and they want my mechanic to take the cam apart? My question is what exactly has to be done to prove a rod knock (blown engine)?

My car has 106835 miles.
My car has an automatic transmission.

Hello. This engine does have a series of common issues that can cause a knock. I have seen quite a few of them with rod knocks, but most of the time the issue is the timing chain. The warranty company is looking for the evidence to show where the noise is coming from. If it is a rod knock then the mechanic should be able to show them where the rod bearings are worn out causing the excessive clearance. If the bearings are fine then it is not a rod knock issue. The timing chain should have been checked for excessive slack before the engine was disassembled to see if that was the cause of the noise. Keep in mind that the warranty company is looking for any reason to either keep this repair as inexpensive as possible or even deny it if they find reason to. This really falls in the hands of your mechanic and what he can prove which should be an easy job.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: When I brake I hear a clicking noise.

Sometimes when brakes are replaced, a piece of the sheet metal shims can be bent, leading to clicking or even screeching sounds. Or your noise may not be related to the brakes at all. If you hear the noise when...

Q: every two days I'm constantly filling up my coolant resivior because it will get down to min level. car does not get hot temp gaug

You are loosing coolant somewhere. I would have the cooling system pressure tested by a mechanic to see if the cooling system is leaking externally or internally. Once the pressure is put on the system then a leak check can...

Q: Vibration at highway speeds from 50mph and up

Hi there. What you're describing is typically an indication of damaged wheel bearings. One warning sign of a wearing out wheel bearing is a loud grinding or roaring sound that comes from the tire area of your car. This is...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...