Questions tagged [valve]

Refers to engine intake or exhaust valves.

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2answers
61 views

Compression of valve springs and camshaft rotation

As you know, in most cars it is not easy to turn the intake or exhaust camshaft by hand. You probably need to use both hands, grab the cam sprocket and apply a lot of force to rotate them even with ...
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40 views

How to interpret "crankshaft adaptation inlet Grad KW" value?

I'm trying to understand the meaning of this value and the implications of it being over the 120 limit. Do you think you could help me out with some thoughts about it? I think it should say "...
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24 views

Testing valve grind job that previously leaked

I had a leaky intake valve so I took that cylinder head off to grind it. Before grinding, I tested that it was indeed leaking and that the other two cylinders in the head did not by setting it on ...
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2answers
25 views

What keeps valve stem seals from dislodging from valve guides?

A valve stem seal, which prevents oil from the camshaft case from penetrating into the combustion chamber, is mounted on its valve guide simply by fitting it on with tension. Yet it endures probably ...
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2answers
379 views

Reusing valve stem seals

I just lapped my valves on a cylinder because they were leaking and reused the stem seals. Should I put new stem seals or is it okay to reuse them?
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1answer
36 views

Effects of intake valves leaking

I just measured cylinder leakdown rates on my 2007 Tacoma V6. 5 out of the 6 cylinders had retention rates of 75-85% (leaking 15-25%) but my cylinder 4 (left engine bank in the middle) was leaking ...
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1answer
24 views

Lubricating inside valve tappets/shims

Toyota engines come with tappets to shim between the valve rods and the camshaft. They look like small cylinders and are about the size of 2 oz shot glasses. When installing them on top of the rod ...
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1answer
41 views

Camshaft valve clearance and fuel consumption

Does the clearance between the camshaft and the top of valve tappets (AKA lifters AKA shims) affect fuel consumption? I am asking because it seems to me like the lesser the spacing, the more the cam ...
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1answer
31 views

Minor discrepancy in valve clearance reading

I started my engine work on a V6 Toyota Tacoma 3 mohths ago and continuing now from where I left off. Back then I did a valve clearance measurement on all the 24 valves with all the timing chains on (...
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2answers
52 views

Correct installation of hydraulic valve lifters

I was doing some research about removing and installing hydraulic valve lifters. I watched some videos on Youtube and found this one quite informative. However, there are a few questions I should ask. ...
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1answer
411 views

Stuck valve in lawn tractor Briggs & Stratton OHV

My John Deere LA120 lawn tractor has a Briggs and Stratton 21HP OHV engine that quit suddenly. Bad gas was my first guess. Along the way, I discovered a leaky fuel pump. So far, I have now replaced:...
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1answer
25 views

Valve lifter replacement based on clearance check

Since I have the valve covers off on my 2006 Tacoma V6, I decided to do a valve clearance check. The manufacturer recommended ranges are: TYPE MIN MAX IN 0.006 0.010 EX 0.011 0.015 meaning the ...
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1answer
22 views

Turning crankshaft specific angle

To check the valve clearances, the Haynes manual for my Tacoma (2006, V6) says to first set the first cylinder of the firing order in TDC, do a sequence of valves, then turn the crankshaft 2/3 turn (...
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26 views

Can too much space between valves and camshaft cause oil in cylinder?

My 2006 Toyota Tacoma v6 is losing profuse amounts of oil although it runs just fine after adding more. I did a comprehensive overhaul several years ago and tuned the valves (ground them and ...
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0answers
52 views

Less oil on certain valves than others

I've got a 1986 3.8l 6-cylinder mustang. I've been hearing a ticking underneath the driver's side valve cover, so I took it off. I didn't see anything wrong so I started the engine sans valve cover. ...
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1answer
49 views

What are the pros and cons of valves being placed in a line vs valves being placed side by side in 2V engines?

As you can see in the picture below the valves in this ferrari dino dohc 2 valves per cylinder v6 engine are placed side by side and not in a row. And as you can see here in the other picture below ...
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1answer
48 views

Which part of the valve stem do i need to replace?

I cant tell which part is messed up (I hit it with a hammer accidentally while trying to get my tire off). Do I need to replace the whole system, or just the body?
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1answer
148 views

Are valve shims re-usable?

I'm in the process of re-shimming the valves on my 1994 Suzuki Katana 600. For the valves where I need to replace the shim, should I save the old shim I removed, or is it considered a disposable item ...
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2answers
63 views

Air intake cleaning/ yes or no?

2007 Impreza wagon 2.5. Previous owner didn’t take car of it and I was thinking of using the CRC intake valve cleaner. I would love your opinions on whether to do it or not. Please explain why it’s ...
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1answer
37 views

Tool requirements for moving rocker arms?

1994 Suzuki Katana 600. Manual says to pry the rocker arm aside "using a suitable tool" to get at the valve shims (unlike some other bikes where the procedure is to remove the camshafts). ...
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1answer
65 views

What to do in case of shim under bucket with no clearance?

Went to do the valve clearance check on my 1994 Suzuki Katana 600 and was dismayed to find that I have zero clearance on any of the valves... Even my thinnest feeler gauge won't slip between and it ...
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0answers
53 views

EJ205 - Valves Seats Recut and Reseated by machinist then failed leakdown test on engine stand

After getting the community's help on my previous question, I sent my cylinder heads to a local machine shop to get a valve job done (valve seats cut, valves reseated, and valve clearances redone). ...
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53 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 (...
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1answer
113 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 ...
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2answers
105 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 ...
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1answer
71 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 ...
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0answers
31 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 ...
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1answer
76 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 ...
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0answers
119 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 ...
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1answer
470 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
1k 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
31 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
180 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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34 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
596 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 ...
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0answers
412 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 ...
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1answer
328 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 ...
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1answer
1k 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 ...
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1answer
994 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 ...
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1answer
522 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 ...
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1answer
1k 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 ...
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1answer
1k 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 ...
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0answers
27 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 ...
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1answer
597 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 ...
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1answer
629 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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1answer
3k 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 ...
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2answers
1k 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 ...
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0answers
166 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 ...
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1answer
203 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 ...
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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 ...