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Revtech 100 cube motor which jug is da number piston..trying to find tdc on motor

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

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Posted on Jan 02, 2017

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SOURCE: messed up and took head off without putting #1 piston at TDC

Hi there.... I'm assuming you have the head back on. the easiest way is to try and line up the timing marks an the pulleys and install the timing belt. If you have done this and the timing marks line up as they should, you can take the sparkplug out of the #1 cylinder and manually turn the engine over till you can feel air pressure coming out of the plug hole. continue turning the engine till you can't feel anymore pressure. Don't go too far cause then you'll be on the intake stroke and you'll have to turn the engine the opposite way. with the #1 cylinder at TDC, take you distirbutor and cap and figure out what position the rotor should be at for #1 plug. Mark the distributor somewhere where that position is ( where the #1post on the cap should be). Finally insert the distributor and try to get the rotor as close to that position as possible. remember when you install the distributor, The rotor position will move due to the gear set up. Once you have the distributor istalled, you can adjust the distributor for timing by turning it. Hope this helps you out. If you have any other questions, please don't hesitate to ask..


Posted on Jan 03, 2009

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SOURCE: How do I locate the number one piston and the

To put at TDC, on the transmission housing, where it bolts to engine block, will have a rubber plug, remove and align pre diagram, there are for stander or automatic transmission, the one where you can see the flywheel is stander, or you could align the crankshaft pulley, hope this was very helpful.


Posted on Sep 15, 2010

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SOURCE: I have a 2001 Isuzu Vehicross 3.5 engine. Which piston do I set the timing on of which must be at TDC? Is it the number one piston or number two piston?

number 1 piston should be at top dead center. remove the number 1 plug and insert a straw, or a soft object in hole on top of piston. this way when it is all the way up and just before it starts to go down you will know. if it has a dist. make sure rotor button is facing number 1 plug wire. good-day !

Posted on Dec 08, 2011

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SOURCE: should the rotor button be pointed at tdc or at the number 1 plug with the number one piston at tdc

should be just before the #1 plug because it fires as the piston has already started to go down. make sure its on the compression stroke and not the exhaust stroke

Posted on Mar 13, 2013

Testimonial: "very helpful clear in his wording knowledgeable in the advise given "

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SOURCE: mitsubishi timing does the number one piston have to TDC

yes that is the timing mark on the crank pulley and lines up with the marks on the housing or pin.

Posted on Mar 24, 2013

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How to set Valve clearence in Mitsubish Lance 1987 Engin model G15B

When Piston 1 is at TDC, (timing points inline), both valves are closed and there should be a gap, say 12 thou on exhaust and 8 thou on inlet. Turn the engine until Piston 2 is at TDC, (both valves closed as with number 1) and adjust, keep going until all pistons have had the clearance set.

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I believe the timing marks no longer line up after replacing my timing belt. How can I determine if correction is needed? How do I correct timing mark alignment?

there is a method but you will have to have an understanding of valve timing
in an engine regardless of number of pistons when number 1 piston is TDC not firing, then the exhaust valve will be open and ready to close and the inlet valve will be closed and ready to open
so bring the piston up and near tdc
as you approach tdc you will see the exhaust start to close and at the same time the inlet valve will start to open
if you rock the crank back and forward slightly at tdc you will see that the valves are rocking
this is valve rock and indicates the cam is in time with the crank
it is only necessary to do it with no 1 piston
It doesn't matter how many cam shafts ( one cam shaft can be inlet valves only and the other can be exhaust valves only) there are, it is the exhaust and inlet valves for no 1 piston that you are looking at
how do you get tdc-- remove a plug and with a piece of wire place the end on the piston crown and as the piston comes up the wire will be pushed out as you rock the piston the wire will move in and out and the point before movement is tdc
probably as clear as mud unless you are engine savvy

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After top dead center what valve starts opening number 1 intake or number 1 exhaust?

It depends on which TDC you are talking about, compression TDC or exhaust TDC. On the compression stroke, no valves will open after TDC-this is when combustion has occured, the power stroke. When the piston reaches bottom and starts up on the exhaust stroke, then exhaust valve will open. At TDC of exhaust stroke, exhaust valve will be closed, and the intake valve will then open as piston is moving down.
If you have the intake valve opening right after TDC, you are on the exhaust stroke of that cylinder. The exhaust valve is only open during upward movement of the piston on the exhaust stroke. Immediately after TDC of exhaust stroke, the intake will open as the piston travels downward.

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Number 1 on the dist cap-- is at about 7 o clock,
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1&2 are at the front-- as you face it

Sep 14, 2013 | Cars & Trucks

1 Answer

Engine valve timing

To find TDC remove number 1 plug and place the crank pulley timing mark on tdc . Using a piece of soft wire etc move the crank back and forth and determine when the piston is not moving That will be TDC no 1 piston It should line up with the TDC and mark on the pulley.

Apr 26, 2013 | Cars & Trucks

1 Answer

Should the rotor button be pointed at tdc or at the number 1 plug with the number one piston at tdc

should be just before the #1 plug because it fires as the piston has already started to go down. make sure its on the compression stroke and not the exhaust stroke

Mar 13, 2013 | Cars & Trucks

2 Answers

Reset timing on chain for 85 olds cutlass

I used to have one of these...there are 2 top dead centre positions you have to watch for. Top Dead Centre "Compression" and Top Dead Centre "Exhaust".

With the distributor cap on, you will know where number 1 is on the distributer, remove the distributor cap and then turn the motor using the crank...keep turning until you see the rotor pointing to number 1. If the number 1 piston is at TDC then you are good to go with it being at TDC Compression- rotor at 1.
If your rotor is at number 1 but your number 1 piston is down then you need to remove the distributor from the rotor 180 degrees then slide the distributor back into the block carefully...remembering to be careful because your oil pump is run by a shaft which snaps onto the bottom of the distributor.

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3 Answers


You have to check the valve's on #1 cylinder. When your pointer is lined up with 0 on the crank the piston is at TDC. But you need to turn it past tand watch to see which valve opens. If the exhaust valve sarts to open then you have it timed right. If it doesn't open turn the engine a full rotation back to 0 and check it again. The exhaust should start to open this time. That is where your distributor rotor button should line up at #1 plug. Hope this helps.

Apr 07, 2010 | 1986 Ford F 350

2 Answers

We have an 86 Ford F250 Inline 6. Where is TDC? We thought we had it, but when we set it, the number one piston is down.

Hello cnu_gurt: My name is Roger and I will help. The surest way to tell is to remove the number one plug. Place your finger over the hole. Bump the engine over until you feel compression coming up against your finger. Watch the harmonic balancer to see when the pointer is at TDC. It may be easier to turn the motor over with a wrench as it gets close to TDC. THis way you wont pass the mark. Set your fire order in the cap starting with number one . locate number one in the cap as to where the rotor is pointing.
Should you need further help please just ask. Please rate the answer as this way i know this was helpful. Thank You for using Fix Ya. Roger

Jan 08, 2010 | 1986 Ford F 250

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