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Tamiya TNX 5.2r

Old 04-06-2010, 01:45 PM
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Bobroham
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Default Tamiya TNX 5.2r

I am new to Nitro RC's. Yesterday I picked up my new TNX. After trying and failing to start the engine, my battery on my starter died so I used an electric drill.
First I used it on full power clockwise(stupid) then when I realized it was clockwise Ireversedit. When I tried it in reverse, my roto starter on the engine snapped in two.
I am thinking of moving to pull start but more importantly, do you think my engine was damaged?
Old 04-07-2010, 06:33 PM
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Default RE: Tamiya TNX 5.2r


ORIGINAL: Bobroham

I am new to Nitro RC's. Yesterday I picked up my new TNX. After trying and failing to start the engine, my battery on my starter died so I used an electric drill.
First I used it on full power clockwise(stupid) then when I realized it was clockwise I reversed it. When I tried it in reverse, my roto starter on the engine snapped in two.
I am thinking of moving to pull start but more importantly, do you think my engine was damaged?
Since the snapped first, I don't think that anything broke inside, but i would check anyways to be sure.
Old 04-10-2010, 02:33 PM
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Default RE: Tamiya TNX 5.2r

you prob flooded it. there was to much fuel in the engine and it locked up. i would take apart the engine and check everything out. if you move to a pull start it will be harder to start. i have all rotostarts and love em. you can look on youtube if you have any probs. they should have videos on starting up your rc. also check the glow plug to it might be bad. just remember if the engine gets hard to turn over it has to much fuel in it. good luck.
Old 06-04-2010, 11:12 PM
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Default RE: Tamiya TNX 5.2r

hi as i have got a tamiya tnx 5.2r i would like to know:

1) WHAT HAPPENS IF I TRY STARTING MY NITRO CAR WITHOUT A GLOW STARTER?

2) WHAT GLOW STARTER DO I NEED?

3) WHEN STARTING WITH THE ROTER STARTER BUT NO GLOW STARTER DOES THE NITRO CAR MAKE ANY SOUNDS OR WILL THE ROTER STARTER JUST SPIN WITH NO NOISE AT ALL?

I WILL BE GREAT FULL IF YOU COULD ANSWER MY 3 QUESTIONS
PLEASE REPLY ASAP
THANK YOU
Old 06-05-2010, 01:42 PM
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Default RE: Tamiya TNX 5.2r

1:It won't start. The glow plug needs the power from the starter to heat up and ignite the fuel and air mix to get it going.
2:Not sure as I don't own a Tamiya nitro. If you can't get any answer here, I would ask Tamiya about it.
http://www.tamiyausa.com/contact/index.php
3:When you spin the engine with the roto-starter, you will hear the engine turning over, but since the glow isn't heated it won't fire.
Old 06-05-2010, 06:42 PM
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Default RE: Tamiya TNX 5.2r

what if when  you spin the engine with the roto-starter and there is no sound at all also the roter is just goin in circles as a screw would?


please reply asap
thank you 4 ur last answeres

Old 06-06-2010, 07:25 PM
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Default RE: Tamiya TNX 5.2r


ORIGINAL: tamiyatnx786

what if when you spin the engine with the roto-starter and there is no sound at all also the roter is just goin in circles as a screw would?


please reply asap
thank you 4 ur last answeres

It may be quiet, but there should be a little bit of noise as the engine compresses the fuel /air mix. All gasoline and nitro engines spin fully in one direction.
Old 06-09-2010, 02:40 PM
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Default RE: Tamiya TNX 5.2r

hi as i would like my tamiya tnx 5.2r to be a pullstart rather than a roto start. what pull start will i need for this engine?

tamiya tnx 5.2r
.32

please reply asap
Old 06-10-2010, 09:15 AM
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Default RE: Tamiya TNX 5.2r



PEPOLE I NEED HELPPPPP
I HAVE JUST PURCHASED PRODUCTS WORTH £50 FOR MY TAMIYA TNX 5.2R

AND I HAVE A PROBLEM
THIS PROBLEM IS THAT WHEN I ROTER START THE CAR THE ROTER START JUST SPINS IN CONTINUES CIRCLES  AND THE CAR DOES NOT MAKE A SOUND OR START WHY IS THIS?????

PLEASE SOMEONEE

Old 06-10-2010, 11:09 AM
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Default RE: Tamiya TNX 5.2r

Well, it's going to spin in circles(that's how gas and nitro engines work), but it it's not making any sound, that's not good. If you turn the shaft by hand, does it offer much resistance? If it spins very freely(as if the shaft was just spinning on bearings), then you may have broken the connecting rod(the rod that connects the piston to the crankshaft). A broken connecting rod would cause free spinning and no noise because it is what moves the piston and the piston is what causes the resistance and noise when it moves. To be sure, though, you may need to remove the engine and open it up or take it into a hobbyshop that does repairs if you don't feel comfortable working on it yourself. If you do decide to work on it yourself, be sure to keep the parts organized. Sometimes I take a piece of cardboard and punch small holes in it with a tiny screwdriver to put the screws in. By each screw or group of related screws, I write what part they go to.

Here's a good guide on taking apart a nitro engine.
http://www.msuk-forum.co.uk/topic/20...-engine-apart/

Tamiya has some good info on their site about the TNX, too...
http://www.tamiyausa.com/product/ite...oduct-id=43530
...including an informative exploded view pdf.
http://www.tamiyausa.com/pdf/exp/43530e.pdf
On pages 8 and 9 it shows how to remove the engine and take off the muffler, clutch and starter housing.
On page 16 it has an explode view of the engine, which should help you out.
Old 06-10-2010, 01:58 PM
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Default RE: Tamiya TNX 5.2r



well turning it one way is a bit not much but a bit harder than the other direction so i dont no whats the problem

will the problem still be there if i was to change the car to pull start?

please repl

Old 06-10-2010, 07:30 PM
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Default RE: Tamiya TNX 5.2r

ORIGINAL: tamiyatnx786



well turning it one way is a bit not much but a bit harder than the other direction so i dont no whats the problem

will the problem still be there if i was to change the car to pull start?

please repl

One thing that you can do that will really help me diagnose the problem is remove the glow plug and look into the hole while turning over the engine. Can you see the piston moving up and down?

Most likely changing it to pull start will do nothing but give you some sore fingers.
Old 06-10-2010, 07:32 PM
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Default RE: Tamiya TNX 5.2r



does turning over the engine mean roter starting it?
im sorry im nt good with rc cars

Old 06-11-2010, 06:54 AM
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Default RE: Tamiya TNX 5.2r

ORIGINAL: tamiyatnx786



does turning over the engine mean roter starting it?
im sorry im nt good with rc cars

Yeah, it doesn't matter it you use the motor to turn it or if you do it by hand, just as longs as it's turning so you can see if the piston is moving up and down.
Old 06-13-2010, 08:04 PM
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Default RE: Tamiya TNX 5.2r

well iv done what you told me which is to remove the glow plug and turn over the engine and as far as i can see nothing in the hole is moving

what does this mean?

please reply asap
Old 06-13-2010, 08:27 PM
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Default RE: Tamiya TNX 5.2r

Maybe your one way starter bearing broke, maybe you broke the connecting rod.

Nothing personal but do yourself a favor and take your engine to a hobby shop or have someone you know who has a fair amount of experience with repairing rc nitro engines. Then ask them to show you how to tune it and start it properly before you ever try to fire it up on your own.


Good luck
Old 06-13-2010, 08:28 PM
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Default RE: Tamiya TNX 5.2r

how much will this cost to repair you think?
Old 06-15-2010, 02:39 PM
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Default RE: Tamiya TNX 5.2r

It depends which it is.

There is an exploded view on this page.
http://www.tamiyausa.com/product/ite...oduct-id=43530
Use pages 8 and 9 to remove the engine from the truck and remove the clutch. Turn the shaft that the clutch was on and look into the glow plug hole again. If the piston is now moving up and down, it is the one way bearing in the starter assembly, if it still isn't moving it is probably a broken connecting rod.
Old 06-20-2010, 07:57 PM
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Default RE: Tamiya TNX 5.2r

hi mate im sorry i have just relized that my tamiya tnx 5.2r pistons do move up and down
i realized this as i have opened the engine but it is abit hard for the piston to move

so now do you have a solution to the problem as the piston does move?

please reply asap
Old 06-20-2010, 08:12 PM
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Default RE: Tamiya TNX 5.2r


ORIGINAL: tamiyatnx786

hi mate im sorry i have just relized that my tamiya tnx 5.2r pistons do move up and down
i realized this as i have opened the engine but it is abit hard for the piston to move

so now do you have a solution to the problem as the piston does move?

please reply asap
Does the piston move when you turn it with the rotostart? If no, it's most likely the one way bearing in the starter case(on the engine). If yes, then the problem is not the starting system. Is it any harder for the engine to turn now than before(when it ran)?
Old 06-23-2010, 04:48 PM
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Default RE: Tamiya TNX 5.2r



hi as i have opened up my engine i can seem to get the piston sleeve out



i just wanted to know how to take it out?



any website which could help!



please reply asap

Old 06-24-2010, 08:08 AM
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Default RE: Tamiya TNX 5.2r

http://www.rcgroups.com/forums/showthread.php?t=658987
Old 08-25-2010, 02:14 AM
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Default RE: Tamiya TNX 5.2r

Hi as I have opened up my engine and I have discovered that the engine piston and the thing that it rotates with are both very rusty which causes problems for the engine to start as they are very hard to rotate. how can this be fixed ?

please reply asap
thank you

Old 08-25-2010, 02:16 AM
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Default RE: Tamiya TNX 5.2r

Hi asIhave opened up my engine andIhavediscoveredthat the engine piston and the thing that it rotates with are both very rusty which causes problems for the engine to start as they are very hard to rotate. how can this be fixed ?
please reply asap
thank you
Old 08-26-2010, 03:19 PM
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Default RE: Tamiya TNX 5.2r

ORIGINAL: tamiyatnx786

Hi as I have opened up my engine and I have discovered that the engine piston and the thing that it rotates with are both very rusty which causes problems for the engine to start as they are very hard to rotate. how can this be fixed ?

please reply asap
thank you

Sand the rust parts with VERY fine sandpaper. That way it will remove the rust and polish the part instead of removing the rust and leaving scratches in the surface. Also, are you sure that it's rust? The piston, I believe, is made of aluminum.

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