Why Timing Belt Replacements Can Be Tricky

Most cars and light duty trucks have timing belts. The transverse mounted engines, or known as front wheel drive, can be tricky with removing and replacing a timing belt.

There are three types of timing belts

  • Single overhead cam timing belt
  • Dual overhead cam timing belt
  • Dual overhead cam twin head timing belt

Single overhead cam timing belt

Single overhead cam timing belts can be a little tricky to replace. Some vehicles have brackets, pulleys, or cooling hoses in front of the timing cover. Keeping the camshaft and crankshaft in alignment are pretty simple on single overhead design when replacing a timing belt.

Dual overhead cam timing belt

Dual overhead cam timing belts can be tricky as well. Most vehicles today on the market have a cylinder head design that has the valve train enter the combustion chamber at an angle of forty to eighty degrees. This is critical when removing the timing belt due to the alignment of the valve train. When removing a timing belt on a dual overhead camshaft, the two camshafts are preloaded with springs. One camshaft may have a load on shaft resulting the camshaft staying put during the belt removal. However, the other camshaft will not have a load on it and the shaft will turn under spring pressure. This can cause a valve to make contact with a piston allowing the valve to bend.

To prevent a camshaft from rotating when the timing belt is removed a cam lock tool is to be used. a cam lock tool locks between both camshafts and keeps them together from rotating.

Dual overhead cam twin head timing belt

The most complex type of timing belt replacement that can be very tricky to perform is a dual overhead cam twin head timing belt. This type of belt is a single belt that is used on a v configured engine with dual overhead camshaft heads. Most v-6 engines with overhead timing may have this type of belt. When replacing this type of belt it is important to have two cam lock tools for there are two sets of cylinder heads on the engine.

On transverse engines, the timing belt can be tricky to remove for there is limited space to access the belt. Some vehicles it is easier to remove the belt from the top of the engine, but on most vehicles, the wheel and tire assembly must come off along with the inner fender, if it is a bolt on design, to access the lower bolts to the timing cover. Most timing covers are now one piece resulting in removing the harmonic balancer located on the crankshaft.

Some engines will have engine mounts in the way of removing the timing belt and making it difficult to extract the belt. In this case, supporting the engine and keeping it from moving will help aid in removal and installation of the engine mounts, commonly known as dog bones.

Timing belts are to be changed based on the manufacturer's recommendation time frame. It is ok to change a timing belt earlier than normal but not recommended.

  • Note: If a timing belt has broken off, be sure to check the engine to see if it is an interference or non interference engine. Plus, realign the timing, install a new belt, and perform a leak down test to ensure that the engine is indeed ok for normal operations. YourMechanic has services available to replace your timing belt.

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Recent Timing Belt Replacement reviews

Excellent Rating

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Rating Summary
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1,230
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Chris

22 years of experience
2223 reviews
Chris
22 years of experience
Toyota 4Runner V6-3.4L - Timing Belt - Anaheim, California
Chriss was really great. I appreciated his knowledge of my vehicle. He shared maintenance tips. Oh and he did a really good job with a difficult ask. New timing belt, drive belt, Radiator. Thank you!
Honda Odyssey - Timing Belt - Murrieta, California
We always use Chris for our auto repairs when he is available. He is very reliable and does a good job.

William

34 years of experience
517 reviews
William
34 years of experience
Ford Ranger L4-2.3L - Timing Belt - Phoenix, Arizona
I was scammed out of 2300 dollars by another mobile mechanic who said I needed a new engine. William came out and replaced the timing belt and water pump. He explained everything to me and was honest when asked certain questions. I will use this service again because William is now my mechanic. Great service.
Honda Pilot - Timing Belt - Phoenix, Arizona
Awesome person, friendly and did a great job. Had my timing belt done with the pulleys, water pump and thermostat. Defenitly knowledgeable in his field of work and will be using him again in my future repairs.

James

30 years of experience
873 reviews
James
30 years of experience
Honda Pilot V6-3.5L - Timing Belt - Kissimmee, Florida
This was a great first experience with YourMechanic. James was professional and worked diligently to get the job done. Highly recommend and will be using him again. Thanks!
Chrysler Sebring - Timing Belt - Orlando, Florida
James kept in touch with me the day of the repairs. Hard-working guy! Stay and finished job till late evening. Timing belt, new water pump and valve cover. So far so good! Thank you James!!

Jermaine

24 years of experience
244 reviews
Jermaine
24 years of experience
Lexus GX470 V8-4.7L - Timing Belt - Clarksville, Maryland
Jermaine always does a great job. He has worked on three of my cars, and done efficient and flawless work. He's a great guy too.
Honda Ridgeline - Timing Belt - Rockville, Maryland
I want to thank Jermaine for the quick, professional service on my 06 Honda Ridgeline. Outstanding. I didn't know what to expect, but after he completed the work and was explaining what he inspected afterward, I was very pleased. He was very professional and was able to help diagnose another potential issue. This is the first time I used "yourmechanic.com" and from the estimate I received (both timeframe and money), compared to the auto shops around town, I couldn't believe what could be done outside my home. After this experience, I will be a returning customer.

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