9
votes
Accepted
What exactly is a jackshaft?
@Zaid Thanks for contributing this knowledge! I just want to post my own description because it took me more than one read-through to understand your answer.
My understanding of the situation:
Ford ...
- 1,945
8
votes
What exactly is a jackshaft?
Much of the information in this answer is adapted from this excellent forum post
In the generic sense
A jackshaft refers to an intermediate shaft that transmits rotation/power from one shaft to ...
- 39.2k
7
votes
What exactly is a jackshaft?
Your explanation of the application in the Ford motor is spot on. To answer the original question of "what is a jackshaft?" in a broader context: a jackshaft is simply a shaft that transfers ...
- 536
7
votes
Accepted
Can I rotate a camshaft backwards on a Toyota DOHC engine if no timing belt is installed?
It's either in time, or it isn't.
You can rotate cams on a non-interference engine in any direction, all you want. However, in general I'd suggest it's best to only rotate only in the natural engine ...
- 12.4k
6
votes
How are rotary valves sealed
From the same site, an explanation of the differences between the two types of valves shows theres still a valve seal. I suspect this is the only part where clearences have to be tight.
- 2,665
5
votes
How are rotary valves sealed
Since there really isn't any information out there directly related to your question, we can only speculate with an informed or educated understanding of what's going on.
To that end, on the Coates ...
- 162k
4
votes
Accepted
Chevrolet Aveo won't start (codes: P0340, P2106, P2110, P2101)
Is the issue this time with something else like Camshaft Position Sensor? Is there an easy way to know if it is good or bad?
Yes, a p0340 code can cause a no start as the PCM uses the CMP sensor for ...
- 10.7k
3
votes
Chevrolet Aveo won't start (codes: P0340, P2106, P2110, P2101)
These faults are most likely caused by one problem.
If the engine ECU is the Siemens/Simtec model I wouldn't go any further and would send the ECU away for testing and repair. These ECUs are ...
- 2,785
3
votes
Accepted
Triangular Wear Pattern on Edges of Cam Lobes
tl dr: This appears to be normal wear.
If this is your Mazda 626 2.0L engine, I've pulled up a couple of images of used cams from your type of engine.
(NOTE: The images were blown up a bit to show ...
- 162k
3
votes
Valve lifters hitting camshaft when hand cranking
Completely normal. You have hydraulic lifters they take oil pressure to work.They will take up the slack that is causing the noise.
See this video for an better explanation
3
votes
Ninja 300 camshaft failure, possible causes?
This guide flange is a delicate part of the cam. The damage shown is caused by improper disassembly. If the cam caps are loosened while the cam lobes are facing down, the torque of the valve springs ...
- 31
3
votes
Accepted
Why are these cam pulleys constructed differently?
The raised rear lip is used to align the timing belt. It only needs one of these to keep the belt aligned, thus the difference.
- 162k
3
votes
4 stroke valve timing diagram: if valves are open during TDC, wouldn't they hit the piston?
Question 1: This depends on engine design.
In an interference engine, the valves can collide with the pistons, so you need to design the timing diagram to prevent that.
In non-interference engines, ...
- 4,412
3
votes
Chysler Town & Country Cam Shaft and New Engine
A worn camshaft would very likely cause low compression on a few cylinders, depending on which lobes were worn.And replacing a cam and associated lifters ( they ride on the cam) could be a 100 % fix. ...
- 3,733
3
votes
Accepted
BMW 118i (2006), Car stopped in Midde of the road and won't start
While it's possible the VANOS was the original culprit I have to say I don't think it's going to do you much good to address that now.
One of the consequences of a failing VANOS is that you steadily ...
- 10.5k
3
votes
When switching off the engine, do the cam and crank shafts always come to rest in an initial state?
No. An engine stops where it stops because it is random when you turn the ignition off, and therefore there is no set place for it to end up at.
- 162k
2
votes
Accepted
How to re-torque a partially loosened overhead camshaft?
There is now 57K of wear on those camshafts, which wasn't present when the factory worker torqued them down. That means that stresses could have built up in the intervening 17 years
I don't see how ...
- 39.2k
2
votes
97 manual ford ranger throwing a camshaft position sensor code
P0340 is a Camshaft Sensor "A" Circuit Bank 1 code. This could be either a wiring issue, sensor failure, or camshaft/crankshaft timing issue.
Since you've replaced the timing belt, computer and ...
- 10.7k
2
votes
Can the fuse cause my fuel pump not to turn on or is it the camshaft sensor that doesn't let my fuel pump to turn on?
The vehicle computer uses the camshaft position (CMP) sensor signal to do a number of things from engine timing to controlling the fuel injectors. Some vehicles determine when to turn on/off the fuel ...
- 9,005
2
votes
Accepted
Nicked cam journal - how bad is it?
I can't really tell if that is a little corrosion, previous damage or If this is where the cam has perhaps knocked against the bearing surface when you were removing it. If its the latter I think I'd ...
- 5,067
2
votes
How should Camshaft Position Sensor output look on oscilloscope?
Here's something that may help. Bear with me. This is the 'standard voltage' that the technician should observe when checking the ecu pin for proper voltage right out of the manual. "8v or temporarily ...
- 121
2
votes
How should Camshaft Position Sensor output look on oscilloscope?
I'm gonna take a stab at answering some of your questions, even though I'm not familiar with your vehicle.
A perfect square wave may or may not be normal for your car, you'd need to know what type of ...
- 1,637
2
votes
Timing chain replacement and the CVVT system
In general, if you didn't remove the VVT actuator don't worry about it. The reason you reset the position is so that the timing isn't off. I'm unsure of the style of actuator your Kia uses but on ...
- 10.7k
2
votes
Accepted
Does the crankshaft revolution count matter relative to combustion stroke?
I assume that you are talking about a four-stroke cycle, so if you rotate 360 degrees then the engine will be at TDC changing from the exhaust to the inlet stroke which is not TDC for the combustion ...
- 34.7k
2
votes
How many book hours to replace the roller cam in 1999 Chevrolet
Local shop provided answer today His book indicated 13.8 hours
- 21
2
votes
Accepted
Second hand camshaft from another bike - is it safe?
If the camshaft is good then use it.
I would consider making sure the bearing surfaces are free from dirt, oil residue etc
But the caps should be the ones from your engine as they are usually line ...
- 34.7k
2
votes
Old flathead engine: Valves first or cam first?
You need a valve spring compressor to assemble the springs onto the valves and guides and fit the retaining clips (or whatever they are on your engine). This step is actually easier than on an ...
- 2,974
2
votes
Orange color on camshaft
I am guessing on this, but I'll bet the orange stripe indicates the intake cam, while the yellow stripe on the other indicates the exhaust cam. The stripes are in the same relative place on the cams. ...
- 162k
2
votes
Accepted
Why don't car manufacturers make camshaft pulleys with walk blockers as a safety measure?
Not that what Solar Mike is saying is wrong, but to add to his post ...
There's three problems with what you're suggesting:
Some companies DO put the walk blocker on the camshaft pulley. Look at the ...
- 162k
2
votes
Compression of valve springs and camshaft rotation
First of all you should NOT do this. Rotating the cams while the crank is stationary can damage the valves and/or the pistons.
But assuming the head is removed from the engine and there is clearance ...
- 12.1k
Only top scored, non community-wiki answers of a minimum length are eligible