The Only Video You'll Ever Need to Know how 4 Stroke Engine Valving & Timing Works

Master Engine Valve Clearance adjustment settings and valve timing with this Valve Clearance Explained video. A Comprehensive Beginner's Guide to Engine Performance.

Any ambitious engine enthusiast must understand valve clearances. We will study the subject of valve clearances, also known as tappets, and the method of adjusting them in this thorough beginner's guide. We'll also explain how the crankshaft's rotation interacts with the movement of the rocker arms, pushrods, cam followers, and cam lobes in order to maintain proper engine operation. Prepare to increase your knowledge and advance your engine competence!

Why are valve clearances important and what are valve clearances?

Valve clearances are defined, along with the role they play in engine performance.

Investigating how improper valve clearances affect how an engine operates.

Realising the importance of valve clearances in producing the best possible power, efficiency, and durability.

Adjusting Valve Clearance: A Step-by-Step Guide

Tools and equipment needed to alter valve clearance.
determining your engine's unique valve clearance requirements.
Detailed guidelines on how to accurately and correctly modify valve clearances.

Techniques and advice for ensuring accurate adjustment and avoiding typical errors.

Crankshaft, Cam Lobes, Cam Followers, Pushrods, and Rocker Arms: The Dynamics of Engine Function

Separating the crankshaft and camshaft's connection.
investigating the role of cam lobes and how they work with cam followers.
recognising the function of pushrods and how they relate to rocker arms.
investigating the transfer of motion from rocker arms to valve opening and closing.

Optimal engine performance is achieved by coordinating valve clearances.

linking the camshaft profiles and engine designs to the valve clearances.
valve clearances and the effects of valve lift, duration, and overlap.

Adjusting valve clearances to meet performance requirements and engine upgrades.
Suggestions for preserving valve clearances over time and in various operating environments.

You can maximise the performance of your engine by mastering valve clearances and understanding how the crankshaft, cam lobes, cam followers, pushrods, and rocker arms interact. You are prepared to go off on a path of accuracy, performance, and in-depth comprehension of engine mechanics with the help of this beginner's handbook as your trusted resource. Prepare to increase your engine knowledge and release all of your passion!

For an internal combustion engine to run and operate at its best, proper valve timing must be maintained. The perfect synchronisation of the intake and exhaust valves' opening and closing with the motion of the engine's pistons is referred to as valve timing. For optimal fuel combustion, power production, and engine longevity, proper valve timing is crucial. The following factors are crucial for establishing proper valve timing on an engine.

Camshaft and Crankshaft Synchronisation: The synchronisation of the camshaft and crankshaft is the main factor in controlling valve timing. At particular times during the engine's cycle, the camshaft's lobes press on the valve lifters or followers to open and close the valves. In contrast, the pistons are raised and lowered by the rotation of the crankshaft. It's crucial that these two parts are properly aligned.

Timing Marks: The crankshaft and camshaft gears or pulleys of most engines are marked with timing marks. These markers line up when the number one cylinder's compression stroke is at top dead centre (TDC) for the engine. These marks must be properly aligned to guarantee that the valves open and close in accordance with the movement of the piston.

Timing Belt or Chain: To link the camshaft and crankshaft, many contemporary engines employ a timing belt or timing chain. To maintain precise valve timing, these parts must be in good condition and properly tensioned. Timing problems and probable engine damage might result from not replacing timing belts according to the specified schedule.

Engine manufacturers give valve timing diagrams that outline the precise timing of each valve's opening and closing in relation to the position of the piston and the crankshaft's rotation. When determining valve timing, these diagrams are an essential resource.

Variable Valve Timing (VVT): Some engines have systems that allow them to adjust the timing of the valves in response to changes in engine speed and load. These systems improve emissions control, fuel efficiency, and performance. The proper operation of VVT components must be guaranteed.

Many thanks

Craig (Owner and Creator of The Repair Specialist Channel)

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[oldtownscouts]

I just understood something I haven't understood for like 29 years. Awesome video

[Brettarn]

This was the most comprehensive explanation of how valve clearance works. Much appreciated the effort put in to explain for a newbie like myself. Instant subscriber

[michaelm]

Great explanation and the cut-away motor makes it so much easier for visual learners to see what's happening, when and why. Very well done.

[mirnaw]

I watched it as a marine engineer cadet and helped a lot to understand the principle even tho there are some differences. Thank you!

[ayeleraberra]

This the first time I have learnt how an engine works clearly. Thanks for clearing my confusion. Explained professionally.

[davidmills]

I cant Thank You enough for taking the time to make this video!! I can say that shamefully after roughly 5 hours of my life that I'll never get back trying to adjust the valve clearance on my 2005 Honda Recon ATV, God led me to your video!! What an ABSOLUTE answer to Prayer!! I just could not grasp the understanding of TDC on the "compression" stroke!! I was at my wits I adjusted the valves I dont know how many times, but on the wrong stroke. With the help of your video, I was able to adjust the valves with NO Issues!! Thank you again SO VERY MUCH for the clear and conscise explanation, and the engine prop you used REALLY brought it home!!! Definitely downloading and bookmarking this video :) May The Lord Bless you and your family Brother 🙏

[HankRearden]

Mate, many thanks. Timing has always been intimidating for me. This definitely helps alleviate that fear a bit.

[williamejakita]

I am an Electrical Technologist, and this video has been very helpful in understanding engines. THANKS!

[abhishektalajiya]

Just want to say that as your video title states- this is the only video I'll ever need to learn 4 stroke tappet clearance. 100% After watching this video all my doubts and queries are cleared and the explaination with this model, amazing work man. Just I do hope you make such videos in future as well. And i request everyone to just watch this 11 min video with patience and all your queries will go away.
Thank you again for making such simple video explaination.

[SailingBritaly]

This is a superb video. I've not seen such good - concise, yet thorough - training since I was learning to be an aircraft technician in the Royal Air Force.

Thank you very much, God bless, and let's hope the algorithm pushes this out to many more people. Chris 👍

[uph]

You're the engine's boss! The best explanations ever about small engines. Greetings from Colombia.

[brownclorox]

Amazing video. So much good information. The engine cutout was extremely helpful to visualize what is going on. Bravo!

[oliverklozhoff]

Great video, gf was asking questions that i couldn't explain very well. Your concise and thorough video (and that cutaway engine) made everything crystal clear. Thank u kindly sir! Instant sub!

[benthicmarine]

Probably the only gold star explanation of valve clearances on YouTube. Thank you for this content, liked and subscribed👌

[bxevekw]

What a great teacher you're sir keep it up

[lightship-uk]

Clearly explained, easily understood, concise & accurate. A well presented tutorial.

[changaaleikum]

Great video, i finally understood how it works. thanks.

[RamGaneshapillai-uqld]

Best one, I shall recommend to anyone need it.
Thank you for the post.
I would give you 100%

[ahmadruizhakeem]

Underrated channel. Great explanation for a newie home mechanic to watch, learn, and understand! Thanks, Craig!

[StopMotorClub]

There aren't many folks like you mate, just aren't. This is a class A rating masterpiece. I won't say much let me enjoy your thread of videos.

Hishia, Africa - Zimbabwe.