Question about Cars & Trucks

1 Answer

Need to get cams on compression stroke

Left cam faceing motor out of time

Posted by on

  • mntterror
    mntterror Feb 21, 2012

    I did not break or throw the timing belt , I had to take it off to replace the water pump . And when i was working on getting the crank pully off, the cams got out of time , I know the drivers side times to #1 cylinder , but what cyclinder do I time the passenger side cam to . Is it #2,#4 or #6 cylinder? I know how to check that I am on the compression stroke

  • mntterror
    mntterror Feb 21, 2012

    I believe the passenger side cam is the one that is out off time , because when I put it on the timing mark , it kept wanting to spin pass the timing mark and I would have to turn it back. Does this mean that it could be 180 degrees out?



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 93 Answers

I there are many ways to see if you are on a compression stroke but the best and most definitive way is to remove the rocker cover and watch the vavles as they move up and down while rotating the engine by hand by hand by hand with the ignition turned off.
When you are on the compression stroke both the valves for that cylinder will be in their highest position and there should be some slack between the valve and the rocker arm.
When timing and engines this is usually done on number one cylinder top dead centre compression stroke.

Posted on Feb 20, 2012

  • Trevor Forrester
    Trevor Forrester Feb 22, 2012 will show you how it works.

    both cams should be set to 1 cylinder top dead centre. It is important to remember that one cam operates the inlet valves and the other the exhaust valves.

    The reason you are having a roll on effect is because one cylinder is still under compression. I would suggest that you remove all the sparkplugs and go back to basics.
    Remove the timing cover and realign all the timing marks on the cam shafts and the crankshaft. Most people do not understand that because it is a four stroke engine that the top dead centre is reached twice in one cycle.

    The first time the piston comes to top dead centre it is on the compression stroke and the second time is on the exhaust stroke. The diagram's at the link above will give you an idea how it works.

    You may only be out in your cam timing by one or two teeth or notches, and this can be enough to give you backfire or instability in the firing cycle.

    Unfortunately there is no easy way to fix this, you could just try moving the cam one tooth or notch at a time but unfortunately you may never get it right.

    That is why I suggest going back to basics.




3 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

  • 80339 Answers

SOURCE: 1988 toyota camry 2.0 engine (timing)

Pull #1 spark plug and rotate the engine until you hear air rush out of the cylinder, (plug the hole with your finger if you can), then look at the timing mark, it will be close to TDC

Posted on Oct 04, 2008

  • 1297 Answers

SOURCE: Are your cams in correct time as long as the

as long as it looks like this...


however, this only give you base engine timing

ignition timing is done with sensors and computers

Posted on Jun 09, 2010

Testimonial: "Great information."

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I just replaced a head gasket on a 87 Chrysler new Yorker with a 2.2,l turbo. It's getting gas, the timing belt appears to be on right,I checked it several times, it has an orange spark rather than a blue...

IS this an overhead cam motor? ...sounds like the cam timing may be off.. make sure you put #1 piston at TDC on the compression stroke and time the cam accordingly...

Jul 19, 2017 | Chrysler Cars & Trucks

1 Answer

Can a cam gear be 180 degrees off at TDC on the compression stroke?

No. The crank will turn two revolutions to each full revolution of the cam.

Jan 15, 2015 | Cars & Trucks

1 Answer

How do i set the valve and cam timing on a 1984 honda 200r motorcycle?

XL500 XL250 XR600 XR90 All much the same Piston has to be top dead centre on compression stroke there is a mark on fly wheel as well, make sure you don't move it after setting it up. line cam up with valve case there are two horizontal lines on both sides of cam sprocket they face towards you then line it up with the top of engine case horizontal very important make sure the cam lobes are facing up so they won't be putting pressure on valves when tightened down if everything lined up and nothings moved put top on and bolt down. I forgot you got to loosen chain tensioner then retighten after bolted down, then turn engine over slowly couple of times to make sure every thing good and nothing catching or hitting then check valve clearance ex 0.08mm inlet 0.05

Oct 04, 2014 | Honda Cars & Trucks

1 Answer

I have a oz xe 4.1 lt 250 xflow motor which i have rebuilt and put flat top pistons in bored out 60 thou shaved yella terra head 15 thou and has a very mild cam after lining up timing marks the inlet

when setting up the valve timing it is always done on the exhaust stoke.. Place the piston on TDC and set the valve timing so that the exhaust valve is just closing and the inlet is just opening. Rocking the crank a bit before tdc to a bit after tdc will produce a movement where the exhaust starts to close as the inlet starts to open. This is known as valve rock or valve overlap. The cam modification is of no consequence as the as all that is modified is the valve duration , not when they open or close. With the cam now timed to the crank turn the crank 180 degrees and set the ignition timing to the degrees advanced recommended ( 10-12 degrees bftdc is recommended for starting). Place the HT leads in the correct firing order and when running use a timing light to adjust ignition timing. If you are fitting a new cam then you must bedding in grease and when the motor starts it has to be run at around 2.000rpms for around 10 minutes to set (harden) the cam lobes or else they will wear off very quickly.

Sep 28, 2014 | Cars & Trucks

1 Answer

Dodge dakota 3.9 v6 year 2000 where should rotor point to on cap when cam gear dot at6 and crank gear dot at 12 and on tdc compression stroke it points to number 4 on cap when cam dot at 6 o clock

Make sure you are on the compression stroke. At TDC of compression stroke, the rotor should be pointing to number 1 on the cap. Either you are on the exhaust stroke, or the distributor is 180 degrees off and needs to be reset.

Sep 17, 2014 | Dodge Dakota Cars & Trucks

2 Answers

98 cabrio 2.0 trying to find top dead center.have compression on both revolutions of cam

Of the cam? Is that a typo, because you want to be thinking the crankshaft. The crank turns two revolutions for every single revolution of the cam, the compression stroke and the exhaust stroke. You want to find TDC of the compression stroke. Unless your timing is really messed up, you should have NO compression on the exhaust stroke. The exhaust valve should be open as the piston comes up to TDC on the exhaust stroke. On the compression stroke as the piston starts to rise, a finger over the spark plug hole, you should feel a bit of pressure, and then just turn the crank on around to the zero mark-TDC. Now your cam sprocket should be on the mark, if timing is correct.
Good luck. I have a minor emergency, have to leave, but if you post back needing any more help or questions, I can answer in about 6-8 hrs. Lots of top-notch experts on here-some excellent mechanics. I'm just an old shade tree mech, so I don't get a lot of feedback-hint, hint. lol

Aug 02, 2013 | Volkswagen Cars & Trucks

1 Answer

When timing a 2000 2.4 dohc chain .I know to line the 1/8 holes on cams. Do i need to turn crank two rounds to get on a compression stroke. What i did was replace waterpump and chain move so when i tried...

you replaced the lifters? why? the engine is out of time, the cam position determines if its on compression stroke or not. you may have bent valves, if not you are lucky. the cams have pins to hold them in time and then the chain is installed with crank on #1 tdc (keyway up). if all is lined up correctly and it doesnt have compression, you have bent the valves. Water pump replacement is not a job for a DIY.

Aug 04, 2011 | Pontiac Grand Am Cars & Trucks

1 Answer

Hey guys I need to get changed the timming belt on my hyundai accent 1995 and I can do it myself but don´t have the timming marks diagram, can you please help me?

if its a single cam the marks should be on the backing plate and if it is twin cam the two marks should face each other on the compression stroke of the number 1 cylinder and the same goes for single cams line the mark up with the backing plate in the compression stroke of number 1 cylinder.

May 27, 2010 | 2001 Hyundai Accent

2 Answers

Changed the water pump on my 1997 passport & now the timing is off.

I assume you are talking about valve timing not igntion timing. If that is the case your water pump maybe run by the timing belt. If it is you would need to completely disassemble the timing cover and set the number one cylinder to TDC (top dead center) on the Compression stroke not the exhaust stroke. Once you do that line the timing marks up on cam gears with marks on the side of the head. Then install a new timing belt and tensioner. It is a good idea to always change the pump and belt together. I would suggest buying a manual for your specific vehicle for specific torque specs and exact locations of components and procedures.

Dec 03, 2009 | 1997 Honda Passport

1 Answer

How do I set the Balance Belt & Cam Timing Belt on a Mitshubishi 4g63 16v 2.0l sohc engine please?

tdc @ 1cyl. cam shaft has triangle stamp mark on face of the gear.both valves for # 1 should be closed in compression stroke and triangle should be pointing at left side top of head(9 o'clock) on the silent shaft and oil pump pulleys both marks must align with each other , use a metal rule for a straight would be wise to purchase a haynes manuel for your vehicle.this manuel gives you illustrations and step procedures to align all components on your g63b engine ....chris

May 09, 2009 | Mitsubishi Colt Cars & Trucks

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

65 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

80339 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

john h

Level 3 Expert

15148 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides