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Questions tagged [valve-timing]

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i have 350 chevy the crackshaft and the camshaft are not in time with each other and the engine is assy and the car what can i do to find tdc

crankshaft and camshaft are not in time with each other and the engine is in the car crankshaft was moved with out timing chain on what I do to get them in time with each other
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1answer
187 views

How to set cam timing from scratch for Honda RFVC, DOHC, four stroke?

I'm doing a full engine rebuild on an Honda GB250 clubman, RFVC & DOHC four stroke. I would like to know how to set cam timing from scratch?
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0answers
855 views

Coleman ct100u engine, no start

Verified igniton system is good, cleaned and gapped plug. The engine is is essentially pushing out gas from the carb side and not wanting to start, I don’t know what else to add I’m not really ...
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2answers
195 views

Why don't valvetrains use an idler gear between the cam gears

Related to this question: What would happen if you tried to start an engine with the cam gears meshed Why don't valvetrains use an idler gear between the cam gear to keep the cam gears in sync, to ...
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0answers
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What would happen if you tried to start an engine with the cam gears meshed

What would happen in the case that someone tried to start an engine like this: My guess would be, if the starter has enough torque to overcome the strength of the cam gear teeth, it'd wreck the cam ...
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2answers
200 views

Is there a risk of igniting the incoming charge with wasted spark systems?

I came across a question about wasted spark systems, and I was wondering whether there is a risk of prematurely igniting the incoming fresh mixture charge with that wasted spark. At the top of the ...
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2answers
122 views

Is this valve toast or could I possibly salvage it without tearing into the engine?

I have a 2010 Mustang GT with 4.6L engine that started making a ticking sound which at times is fairly loud. The sound is much less obvious at cold start but becomes apparent after it gets hot. The ...
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2answers
478 views

Prevention against turning of the camshaft during the tensioner replacing in 1 cylinder 2 valves 4 stroke engine

I was wondering if there is any machanism preventing a camshaft against turning during service. It may happen that, when you turn off your engine, the camshaft stops in a position where lobe opens a ...
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2answers
2k views

Noisy 4.6L Mustang engine

My 2010 Mustang GT 4.6L automatic with 97k miles on it has a noise coming from the drivers side valve cover. The noise sounds to me like all of the other typical cam phaser noises; a ticking sound ...
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0answers
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honda accord 2000 lx valve chatter

Timing belt was replaced and now there is a noticeable valve noise at 1600-1900 RPM. No noise at idle. Once you hit 2000 RPM and above no noise. Power is good across RPM band. Checked valve ...
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1answer
148 views

Why is there no valve overlap on 1987 V4 Honda?

I have a 700cc V4 Honda Magna motorcycle. The manual states that the inlet opens at 0° BTDC and the exhaust closes at 0° ATDC so there is no valve overlap. This would seem to compromise power. What ...
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1answer
111 views

Meaning of Timing valve is open

What is the meaning that Timing valve is open? A local mechanic told me to change the timing valve to fix P0018 code. But he is not sure if there are othern hidden issues. Is it possible that Timing ...
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1answer
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What are the various kinds of tappets / lifters and the advantages / disadvantages of each

A previous question about tappets found here: What are Tappets? covers the basics of tappets. If we go the next step, here are my questions: What are the various kinds of tappets / lifters? What ...
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1answer
171 views

1997 Honda Odyssey - How do I know if the valves are still good after both the timing belts broke?

I hired a mechanic to replace my crankshaft pulley sensor. He ended up doing something wrong. We tried to crank it and it sounded like a dead battery and the sensor broke and hit the oil pump. Put a ...
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1answer
1k views

How to test timing chain/belt assembly before sealing engine closed?

I had to take my timing chains (one master and two connecting each V6 sides' double cams) off on my 2007 V6 Tacoma to reach to replace my head gaskets. While I do have relatively specific ...
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2answers
26k views

What exactly is Honda's i-VTEC technology

I see that almost all of Honda's cars have an "i-VTEC" logo at the back. I googled it and came to know that it has something to do with different cam profiles. Can someone explain? A diagram or ...
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1answer
88 views

Last year my timing chain had broken

I have a 2003 Pontiac Sunfire A tooth broke on a sprocket and my timing chain broke. I was told I have a bent valve and would need a new cylinder head. It's has been sitting for exactly a year. ...
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3answers
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Changing Firing Order in a 4 Cylinder Car

Backstory In motorcycling you can get cams that change the firing order and time from a traditional 1,3,4,2. It's was very common in American road racing in the 1990's to hear 4 Cylinder engines ...
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3answers
24k views

Tick Tick sound from a Royal Enfield Classic 350 at idle

I own a Royal Enfield Classic 350. At idle, the engine starts to produce a TICK TICK sound. However it vanishes when the rpm rises and when riding the motorcycle. This question is a very frequently ...
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2answers
26k views

4 stroke valve timing diagram: if valves are open during TDC, wouldn't they hit the piston?

I am studying valve timing diagrams. Many of them show something like (for instance) the exhaust valve stays opens till ~20 degrees after TDC and the intake valve opens ~12 degrees before TDC. Wouldn'...