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Tecumseh 4.5hp small engine

How do I align the camshaft/flywheel when reassembling? And the small plastic "banjo looking piece" on the bottom of the camshaft,which I assume is the oil pump for it,is tapered on one side,does that side face the bottom or up towards the camshaft?

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The crank gear has a marked tooth and the cam has a mark between two of the teeth - the other piece is the govener gear which meshes on the cam - it must be aligned so it contacts the gov arm - without a mod # im not sure which style gov gear you have . there is no oil pump in an engine of that size

Posted on Oct 21, 2008

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No spark in my toro 38080 mod# snowblower,new plus,new gas ,fuel line,primer bulb,line, no spark


The Toro 38080 was made from 1979 - 1993.

With it not producing a spark then you have an ignition system problem. Depending which Tecumseh HM80 engine setup you have you may have either an internal ignition system or external. By this I mean under the flywheel or external to the flywheel. There was also hybrid system that was both internal and external.

This engine could either points based system or a CDI all in one coil pack.

Now if it is an internal points systems it will be major an under taking for someone that never worked on one these engines as if you replace the points the ignition system must be re-timed. Note that where a few fix time setups. You might get lucky and it just dirty contacts which can cleaned without up setting the timing. To gain access to these points the flywheel must be removed.

Probably the best to do first is to download a copy of the service manual to see if this something that you can do or if you what to get a small engine mechanic that is experienced with Tecumseh repair to do.

Ignition system info starts on PDF page 67 (manual page 63) in the following manual. It will explain on how to test and repair the systems involved.

TECUMSEH-SERVICE--REPAIR-MANUAL-3HP-TO-11HP-4-CYCLE-L-HEAD-FLAT-HEAD-ENGINES-.pdf

Dec 27, 2014 | Toro Lawn Mowers

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Can't start no spark lawn boy #10590 5hp


Hi raymond
Make sure you are getting spark at the spark plug, to do this:
Remove your spark plug and check to be sure you are getting a bright blue spark at the spark plug.
You do this by grounding the plug on the head of the engine and cranking the engine or by pulling the crank rope...watching the plug for spark.
If you are getting a nice blue spark then skip A below and go to B.
A...If you do not get a nice blue spark then you may need to replace the electronic module.
Note: If you have to replace the module be sure to measure the position it is in, it is critical to starting.
Take a picture for later reassembly.
B...Also take some fine grit sandpaper (not emery) and lightly sand the flywheel where the magnet is located to clean any rust or corrosion from the magnet area.
Then follow the procedure below:
------------------------------------------------------------------------------------
Sounds like you have dirt/debris in your caburetor jets, fuel passages or a diaphram that is becoming non-flexible.
Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
Note: ALWAYS USE COMPRESSED AIR TO CLEAN YOUR JETS AND PASSAGES, VERY IMPORTANT.
Note:Before you disassemble the carburetor:
Write down on a piece of paper and or take a picture of how the linkage attaches to your carburetor for later reference when you go to reinstall your carburetor.
Mark each piece with a awl, or some kind of sharp instrument that will make an alignment scratch before you disassemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Sometimes you can get by with priming the carburetor or by using a very small shot of starting fluid and letting it run a few times like that, and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Check you fuel line/s condition...after a while they will degrade and need replacement.
Check/Clean/Replace your fuel filter if you have one.
When you remove your fuel lines from the carburetor be sure to make a drawing or take a picture of how the lines are connected to the carburetor.
Also a good time to take a picture for later reference for reassembly.
If the mower is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
The diaphgram may look good and flexible, but it can be deceiving and not act as a fuel pump as it should because it has become too hard and will cause hard starting,start and run and shut off, etc.
When you clean your carburetor, I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use COMPRESSED AIR to blow out all the fuel and air passages.The higher air pressure is needed to blow some of the trash/debris from the fuel or air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit, or you could also ask the parts man that you get your kit from.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor cleaned/rebuilt that should solve your problem.
Bud

Oct 09, 2013 | Tecumseh Lawn Boy Push Mowers Insight...

1 Answer

Tecumseh 8hp snowblower engine kicks back hard enough to break plastic handle. I checked the key in flywheel ,I cleaned the carb,checked the flywheel, andcleaned magnets and coil pick up. I tried to start...


surging when running is most likely normal ,they have a governer that control's the carb & rpm so it wont over rev. It has a paddle near the fly wheel to pick up wind from it when running hooked to the carb with a small lever and held stable by a spring. Check to see if the spring is too tight or sloppy. 8 hp is a pretty big motor and a kick back is not really un expected. But a plastic handle is kinda cheesy, a rubber or a wooden handle would be better.Good thing you have electric start!

Oct 08, 2013 | Lawn Mowers

1 Answer

I have a 1972 tecumseh 5 horsepower engine, what size key way would the pull start use?


Are you talking about the key that goes in the crankshaft To align flywheel properly?

Jul 08, 2013 | Lawn Mowers

2 Answers

Tecumseh engine backfires and wont start


remove the top cover from the engine and then the nut on the top of the flywheel look down at the space between the shaft and flywheel the key between the two might have sheared happens more if you hit a rock

Apr 30, 2012 | Craftsman Lawn Mowers

1 Answer

Wont start, have cleaned the carb, new filter, new spark plug. removed plug and grounded. Very tiny little sparks, not real single snapping spark. Any idea of what could be the problem? Ariens model...


I believe you have a timing problem. Do you remember hitting something hard with your blade? I would say you have sheared your timing key. Order of repair : remove top cover to engine, this may involve gas tank, gas line, oil filler tube. Remove flywheel nut, remove flywheel. Timing key is the small key between flywheel and crankshaft. Timing key may just be dented but it will need to be replaced. Bring it with you, Tecumseh has a few different styles of key depending on engine and year.
GOOD LUCK.

Jun 12, 2011 | Ariens 21 In Classic Walk Behind Push Lawn...

1 Answer

Timing mark on crank worn off(the gear top is worn smooth)on 6hp Tecumseh on a craftsman mower. The cam gear has a alignment bump but none on the crank gear, is there any other reference I can use for...


Yes, there is another reference. You have to watch the cycle of the engine to do it. you should make it so that both valves close just after bottom dead center(compression stroke), and then they should stay closed for a half revolution, then the exhaust valve should open just after bottom dead center again. At the same time, the magnet on the flywheel will pass the coil at top dead center between these two reference points. This way can be slightly exasperating, because you can be off a tooth either way and it won't run right, but will look ok.

Mar 21, 2010 | Troy Bilt 5.5hp Self Propelled Mower

1 Answer

Troy bilt 5.5 tecumseh engingine only stays running when primed then quits...


It sounds liker the jet in the bottom of the carburetor is clogged. You will need to clean it out with a piece of small wire and the engine should be able to get some fuel to run.

Oct 06, 2009 | Lawn Mowers

1 Answer

5 hp tecumseh mower. plug is firing. carburator bowl is full of gas and float is working. won't start!


Check the flywheel key. It is the most common problem I have found when a Tecumseh either wont fire or backfires. When you have the flywheel uncovered, take a nut the same thread as the flywheel. Remove the one from your machine and use the other one for the next operation. Take the new nut, place it on the sshaft in place of the one that was there. Lift the flywheel with one hand (to get a strain on it) and with the other hand, rap the nut with either a wood mallot or a regular hammer. You may have to rap it sharply. The flywheel will come loose and you can see the problem. Go to a small engine repair shop and get a new flywheel key. Install it and go about your cutting. Good luck...Lee

Sep 04, 2009 | Lawn Mowers

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