Originated From

1999 300M Broken Timing Belt

I was driving my 1999 3.5L 300M when steam started coming out of the engine compartment and I immediately pulled over and turned off the motor.   After waiting about 45 minutes, I tried to restart it and it was obvious that the engine was spinning too freely.   I didn't get any noises that were really concerning me but I figured out later that the timing belt had broken. 

My question - since there have been no obvious signs or sounds of  valves hitting pistons and the I can turn the crank and the cam shafts fairly easily (I have the front of the engine taken apart to replace the timing belt),  what are the chances I have not bent any valves?

 Would I have heard metal on metal contact when trying to start the car if valves were being bent?   Thanks in advance for any input.
Liked this question? Tell your friends about it

2 Answers

Order by
Oldest to Newest
Newest to Oldest

You'll have to do a compression test in order to be sure that no valves were bent. You should have heard if a valve wold have hit a piston.

This profile was made using only pure recycled electrons

I have 43 year experience as an automotive tech. I was looking for posts to answers to this same question. I have never done this particular engine, and would like to know before I spend customers money.

However, It's Listed As An Interference Engine In Autodata Tech Series Timing Book, And, One Online Post Quoted Factory Proceedure As Needing To Remove Valve Covers And Loosen ALL Rocker Arms Before Working On The Timing Belt. This Is Very Unusual, So Factory Knows That Valve To Piston Contact Is Most Likely To Happen.

By the way: I can't hear pistons hitting valves when a timing belt breaks. it is not loud enough. It usually just bends some valves a little. The only one I saw where it can be heard is on a Kia 4cyl. where the valves actually BREAK off. clattering around sounding like broken glass until the engine comes to a stop. (for the last time.)

Related Questions

Other people asked questions on similar topics, check out the answers they received:

Asked: On a 2000 nissan quest that jumped time what are ...

on a 2000 nissan quest that jumped time what are the chances that the valves are bent

Asked: How to put a timing belt on a plymouth neon

how to put a timing belt on a plymouth neon

Asked: How long will a timing belt last?

I own a 04 camry. How many years can a timing belt last? The car will never see 90 thousand miles while I own it.

Ask a Question... We'll forward it to people who know

More Questions

What is a timing belt service?

Mostly an inspection.

I need information about timing belts on 1988 chevy nova

Chuck, Thanks for explaining. I was just worried and could not get an answer from anyone. What seemed to make it difficult is that it is a Chevy , but with a Toyota engine. Thanks again. Ken

Time management

Many time management tools are free of cost that are just a pain to use and there are some paid tools that are a waste of time. But my tasks has become easier and be more productive once I started using Replicon software ( http://www.replicon.com/olp/online-time-recording-software.aspx ). At our ...

Time management

Time is money and it is the most precious resource that can never be get back. So, we should use it wisely. We have to realize that time management is a myth. Tracking daily activities is much better and useful too, we can form an accurate picture of what we actually do! To track daily activities ...