Questions tagged [valve]
Refers to engine intake or exhaust valves.
103
questions
0
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45 views
Is there a special procedure for preparing a new but very old stock engine?
I have a 1979 Austin morris (leyland,freight rover) Sherpa campervan 1979 model 230 with a "17v" "o" series engine 1.7 litre. I am soon to replace the engine with a new old stock (...
2
votes
1answer
39 views
Leakdown Test | EJ205 on Engine Stand and replaced all Valves
I have my EJ205 out of my 2003 WRX. I pulled the engine in the first place to troubleshoot a 90% pressure loss in Cylinder 4 (measured via a leakdown test with the Engine still in the car). The ...
0
votes
2answers
34 views
Does lapping valves ensure the seal of the valves?
I am building a 450-500 hp honda civic with a d16y8 head, i purchased brand new valves , and i was wondering how do I get these valves to seat and seal the chamber for combustion? Is lapping the ...
1
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1answer
55 views
Do you have to remove the heads to replace the lash adjuster on a 2002 Ford Escape?
Hello I guess I'm replacing a lash adjuster today. Before I start I'd like to get a better idea of what I'm getting myself into. I know that you're supposed to replace all of them at once and that you ...
0
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0answers
25 views
02 Ford Escape valve ticks on first start in the morning
It's only on the first start. If I leave it running after the first start it will take for a while. Possibly forever I'm not sure. What I've been doing is turning it off after a second or two and then ...
1
vote
1answer
61 views
Should valve pair open and close at same time?
My Audi A5 had some bent valves after the chain tensioner broke. I have replaced the bent intake valves and a single broken rocker arm.
When I reassembled the top, I noticed the first pair of valves ...
1
vote
0answers
75 views
Is it worth replacing valve seals on a car with 200K kms?
I have a honda jazz 2003 gd1 1.3 with 200K kms on the clock. The car started burning oil around an year ago and occasionally (when the oil is topped up) puffing blue smoke puffs through the exhaust on ...
0
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1answer
88 views
Whats the valve clearance measurements for a 2006 Honda fit 1.3L I-DSI (L31A) engine?
I'm planning on adjusting the valve clearances myself for the first time but i don't know the measurements for the intake and exhaust valves clearances since its a second hand car and the manual is ...
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2answers
335 views
Low compression in one cylinder with a misfire code, but no smoke in the exhaust
Chevy V6 4.3 with 281k miles. It recently threw a misfire code isolated to cylinder #3. The misfire seems systematic and not random, though, as it idles rough. I've got an open question on it already, ...
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0answers
26 views
Odd noise from top of engine
I'm helping a friend with their car. Its a 2014 Mazda 2, 1.5L engine, approx 105K miles. The car has been well maintained with regular oil changes.
There is an odd noise coming from the top of the ...
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0answers
58 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 ...
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0answers
30 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 ...
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1answer
411 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
308 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
246 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
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1answer
664 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
610 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
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1answer
188 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
731 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
774 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
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1answer
370 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
506 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
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2answers
790 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
145 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
117 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
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1answer
2k 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
639 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
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0answers
416 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
556 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
226 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
7k 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
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0answers
3k 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
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1answer
807 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
171 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
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1answer
132 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
2k 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 ...
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0answers
91 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
312 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
90 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
749 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
102 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
606 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
111 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
138 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
1k 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
4k 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
2k 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 ...
