Questions tagged [valve]
Refers to engine intake or exhaust valves.
93
questions
1
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0answers
33 views
Valve tap after engine is warm
I have what i believe to be a tappy valve in my 1991 4Runner, V6. It's quiet when the engine is first started, before the oil is warm, presumably. Once the engine up to temp the tap comes back. Does ...
0
votes
0answers
27 views
Is it worth it to try to solve a valve problem on my old Volvo?
I have a 1996 Volvo 850 which has some kind of serious valve or piston problem. The mechanic said that there is zero compression in cylinder 2 (its a 4-cylinder GTS). He said he could not see anything ...
0
votes
1answer
240 views
Will leaking valve seals harm an engine?
I have a Nissan VK45DE engine with some oil consumption issues that I think are leaking valve seals.
What harm will come to an engine if used long term with leaking valve seals other than the ...
2
votes
0answers
186 views
Bent push rod, valve bent as well?
so i finally got around to opening up the head of my lawn mower and found out why it wasnt running.
the intake push rod is bent. and the exhaust is straight. obviously my valves were way out of spec ...
1
vote
1answer
144 views
Benelli TNT 150 has how many valves?
I know my question is out of topic but could anyone tell me if Benelli TNT 150 has 4 valves or 2? Internet wasn't helpful. I am also confused between Benelli TNT 150 and TNT 15.
Thanks
EDIT
To make ...
1
vote
1answer
273 views
Will a hole in flex pipe or exhaust cause burned valves?
I bought a 300 5.7 hemi. It has a hole somewhere in the exhaust. I suspect flex pipe. Old owner said he's been driving it like that for a while. It's really Loud! Will it cause a burned valve? I will ...
0
votes
1answer
294 views
Astra h engine oil consumption
My 2005 Opel astra h (engine code-Z16XEP) has developed some oil loss issue. During autumn months while I've been only city driving, it has consumed very little oil in comparison of what it had ...
0
votes
1answer
53 views
Valve cover gasket; Torquing the cover
I am taking notes on the proper installation of a valve cover gasket. I plan on using Permatex Ultra Black RTV silicone in the process.
One suggestion I read is, after applying the gasket, silicone ...
2
votes
1answer
449 views
Exhaust backfire on reductions/engine braking
I've recently acquired a 2001 Corsa Milenium (a Brazillian saloon version of the Opel Corsa B, with a GM 8V 1.0 MPFI engine). It has a performance air filter (which I plan on replacing with the ...
2
votes
1answer
496 views
Gas leaking from this tube,wondering what exactly this tube is
Hello, I'm fairly new to mechanics of motorcycle(riding for 2 years but never tried to repair it myself till last month).
As I noticed I am using way more gas than usual and there was gas odor, then ...
2
votes
0answers
24 views
Do valve adjusters ever go bad?
Do the top screw parts of the valve adjustment screw ever go bad?
Doing a valve adjustment on 2005 Honda Odyssey. On a few valves, the part that you adjust does not feel right. It is either too ...
1
vote
1answer
221 views
Buick Rendezvous 3400 SFI no start when warm/hot
The problem is that when the engine is warm/hot it does not want to start. I can crank it all day long but it doesn't even sputter. Things I checked:
-Fuel pressure
-Spark (It seems weak? Has an ...
0
votes
1answer
311 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?
7
votes
1answer
2k views
Why when I turn the front wheels by hand, the crankshaft doesn't rotate?
I'm after head gasket replacement and I'm trying to adjust valve clearance.
2 wheels of a fwd 1995 Renault Twingo are lifted off the ground, the engine is in gear, but the crankshaft doesn't turn ...
1
vote
2answers
555 views
Burnt valve diagnosis with broken radiator
The radiator on my 2001 Volvo v40 blew on the highway last week and the engine overheated.
I had it towed to my shop, and let them know the situation, and expressed concern of engine damage because ...
1
vote
0answers
133 views
Toyota Sienna 1999 - Valve Stem seals
I've got a 1999 Toyota Sienna handed down to me from my family.
For the past year, on startup a heavy plume of blue smoke would come out. Researching online, I've read it's related to valve stem ...
2
votes
1answer
78 views
valve adjustment 1984 F150 302
stock cam, hydraulic lifters. when removing the lash and finding the start of "tension" on the push rod how far should the spring loaded part of the lifter depress before you add the final 1/2 - 3/4 ...
1
vote
1answer
1k views
Tapping engine noise, but only with load and only for short time
2003 Toyota Rav4. 4 cylinder, 145k miles. Recently started making a ticking noise. Noise only happens on startup and for about 15 minutes and ONLY when under load. So, start the car and fast idle ...
6
votes
2answers
385 views
How come only one piston was damaged?
This is a 2007 Dodge Caliber 2.0 CRD (which uses a VW Golf 5 TDI engine).
The valves on only 1 piston have come into contact with the piston, causing chaos in that cylinder. The other three are fine.
...
1
vote
0answers
350 views
Valves calibration vs fuel economy
My new hobby car (Fiat 126p, 2 cyls air cooled, rear mounted) is not doing correct fuel economy. Spark plugs looks ok. Fumes, at cold start are black but as it warms up, it looks ok. The only ...
2
votes
1answer
7k views
Check emission system displayed on dashboard display
For the last week it has been extremely cold where I live (varies between -27 to -33 degrees Celcius). Is it possible for a fuel cap check valve to freeze open?
Last night leaving work the display ...
3
votes
3answers
496 views
Can I add a gasket to my exhaust valve to reduce leak and increase cylinder pressure?
So I have a single cylinder diesel engine. We do not use it to produce power (it is operated by an electric motor) but to measure the pressure at low rpm (100-200). The volumetric compression ratio is ...
1
vote
1answer
80 views
Proper electrical cable disconnect procedure for purge valve?
Attempting to replace a canister purge valve (pictured)
Some of the instructions I've read say to disconnect the battery terminals prior to remove the electrical cable and removing the valve.
That ...
3
votes
4answers
4k views
Necessity of checking valve-clearance on 1 cylinder GY6
Engine-valves usually get tighter as they're used.
The symptoms of engine-valves that are too tight, are as follows:
Bad fuel economy
Difficult to start
Stalling idle
The manual for my scooter ...
1
vote
0answers
2k views
When should I suspect that valves are not sealing
I just lost an (old, 230K miles) engine with no compression in two cylinders. It had been drinking oil liberally for a while, but just prior to this failure, had begun seriously drinking oil (6QT per ...
1
vote
1answer
659 views
Probably Tappet noise in my brand new yamaha fz fi
Little Tappet noise from my brand new bike i.e yamaha fz fi india. Svc guys told me it require valve clearance adjustment. My question is, is it ok for brand new bike to adjust valve clearance on its ...
2
votes
1answer
163 views
If I'm lapping valves do I need to replace piston rings?
I just removed the head and am lapping valves because of timing problem. If I'm lapping valves, do I need to replace my piston rings too or not?
Car: 2010 Passat CC 1.8 TSI, 100,000 km
1
vote
1answer
117 views
Can I remove the valve cover to retrieve the extension with 8mm socket that fell into my engine? [duplicate]
I dropped an extension with a 8 mm socket attached into the plug hole. I started the engine for like five to 10 seconds to see if it blew out. I read that starting the engine was an huge mistake. With ...
2
votes
1answer
1k views
Hole-in-One. Small extension and socket fall into valve
I am very poor so I work on my house/SUV (2002 Ford Expedition) myself. Recent misfires had me changing coils and spark plugs. Well, everything is going fine until my extension comes off my socket ...
1
vote
0answers
72 views
Burned valve Ford Focus 1.6 16v (2010)
and thanks in advance for your help.
I have Ford Focus 1.6 16v 2010 model bought brand new.I"v had installed an LPG gas system "Lowato" from the beginning almost,and never had any problems with the ...
2
votes
1answer
189 views
Is there clearance for the valves to go, in case of busted belt on a C4 1.4 V16 2005
I just broke down and had to get pulled.
Car stopped moving mid drive and wouldn't start, the starter would turn but make a strange higher-pitched noise than the usual one.
The guy offered to ...
4
votes
0answers
86 views
Light abrasion on the valve stems - is the outlook gloomy?
Background
I'm rebuilding my LS1 Chevy. The cylinder heads came back from the machine shop fresh with a 5-angle valve job and mechanically-lapped valve faces and seats.
What concerns me is the ...
3
votes
4answers
450 views
Lapping valves by hand - does the compound have to be cleaned off?
I'm hand-lapping valves on the LS1.
This is probably a silly question, but I just wanted to confirm that I have to wipe off the lapping compound prior to the hydro test.
4
votes
1answer
86 views
Should I be concerned about eccentric valve rotation?
Yup, it's that infamous Exhaust Valve #3 again (that "6" is a misnomer). It's now back from the machine shop, with a freshly-cut valve face as part of a 5-angle valve job.
Now that the valve and ...
3
votes
3answers
461 views
How does excessive undercutting of valves make an engine less streetable?
I don't understand a claim made by Jafro's machinist in this video (around 26:00):
(Jafro inspects undercut valve)
Machinist: You drive it on the street too, don't you?
Jafro: ...
2
votes
1answer
84 views
Would using a cooler plug help or even prevent this level of exhaust valve damage
As I posted in a related question:
Help me diagnose the cause of this intake valve burn
Here is depicted an instance of its EXHAUST (not intake) valve burn, the key note being there was a head deck ...
3
votes
2answers
131 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 ...
6
votes
1answer
715 views
Help me diagnose the cause of this intake valve burn
I would like some help diagnosing the probably cause of this intake valve burn as seen in the picture.
167fmm engine.
229cc OHV push rod type.
Now here is the rub.
this is engine originally 9:1 CR, ...
6
votes
1answer
3k views
This valve is pitted - what options do I have?
This is that infamous Exhaust Valve #3 after cleanup. The cylinder had a history of fuel/spark-related misfires.
As the images show, the lip of the valve is pitted.
Here is the back of the valve.
I ...
9
votes
1answer
1k views
Do I risk damaging the valve seat if I lap this valve without removing carbon build-up?
This valve is from my LS1 (Exhaust #3). It's suffered from a lot of carbon build-up due to a history of fueling/spark problems.
I've tried cooking it in ethylene glycol. I've tried using abrasion ...
3
votes
0answers
107 views
Overfill oil on 1.5 Liter VTEC-e Civic 1995
I have a 1.5 Liter VTEC-e Civic 1995. The valves are noisy if I fill oil up to the manufacturer recommended level. But if I overfill by a quart the engine and valves are much quieter.
Is this ...
5
votes
1answer
82 views
Why a two-lever valve spring compressor?
I just purchased a valve spring compressor that has a lever on both ends, similar to this one:
What is not clear to me is the advantage of having this two-lever setup.
What does it have over the ...
2
votes
0answers
81 views
Identify Valve Noise RECORDING
What's that sound?
Sorry a little long (15:00) see notes below for TLDR.
https://drive.google.com/file/d/0B4e9w0OOuGinSVhqMVM5OHQwZ3c/view?usp=sharing
Note good power and smooth shifting at 3m10s ...
3
votes
2answers
472 views
Seat Toledo engine stalls when warm
I have a 2001 1.6 16v Seat Toledo.
Short story:
My car randomly stalled when the engine warmed up to operating temperature and I could not restart until it cooled down. A mechanic cleaned the ...
9
votes
2answers
3k views
Lapped valves still leak but slowly
Background
I did some work on my engine's head valves and their seats. This is a very old engine with very old/abused/invented/adapted parts, etc.
Both the valves and seats were in pitiful ...
9
votes
2answers
525 views
Can leaky cylinder explain oil loss to burning?
One out of the 6 of my Toyota Tacoma cylinders is mildly leaking, as indicated by a cylinder leakdown test. While other cylinders are leaking only something like 5-10%, this one leaks about 20% of the ...
4
votes
2answers
107 views
Are there any downsides to the Coates valvetrain?
There was a lot of buzz around the Coates valvetrain circa 1995. (Animation is too good to miss)
Two decades later, I still don't see mass adoption of this "revolutionary" technology.
So what gives? ...
2
votes
0answers
117 views
Ticking after much engine work
This question is a follow up to this question: 1994 Honda Accord EX (F22B1) - Valves still making a ticking noise
Work I've done
Replaced head
New valves, new seals new gaskets
verified different ...
8
votes
3answers
4k views
Preventing debris from falling in engine while changing valve cover gasket
I am about to change the valve cover gasket on a 2002 Ford Focus SE Wagon with the DOHC Zetec engine. I have never done this kind of thing before, and although it seems simple, I am concerned after ...
1
vote
1answer
67 views
Where do you install cylinder heads, camshafts and valves in different engine types?
I am trying to learn about engines, so my question is where do valves, camshaft etc go inside different engines? I see different engine have them in different places, base on if the engine is a inline,...
