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Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 14304
Experience:  Degree in Marine Technology. Gas and diesel marine mechanic.
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Tohatsu tldi 70hp no start, bacfires out of exhausst

Customer Question

Tohatsu tldi 70hp no start, bacfires out of exhausst
Submitted: 2 months ago.
Category: Boat
Expert:  Noel Schembri replied 2 months ago.

Hello my name is ***** ***** I will assist you. Normally from what you are describing it looks like the leads going to the spark plugs may have been swapped and thus firing when not supposed to fire creating the backfire.

Check these leads to be going to the corresponding spark plug and let me know.

Noel

Customer: replied 2 months ago.
Leads can only go in one order, they will only reach the correct order.
Are you a tohatsu tech?
Customer: replied 2 months ago.
Ive dished enough cash at this point, but thanks!!
Customer: replied 2 months ago.
I personally have 30 years in the mechanical trade, and have been through this tohatsu tldi outboard, in and out, multiple times!!!
Customer: replied 2 months ago.
These tldi motors, are wat I would call a unnessesary configeration, to get to a low pressure direct injection setup!
Expert:  Noel Schembri replied 2 months ago.

Ok then if the firing order is next thing to check is theair and fuel pressure. Did you check this? Air pressure should be between 88 and 101 psi whilst fuel should be between 97 to 113 psi. Also make sure the compressor belt is not loose.

Noel

Customer: replied 2 months ago.
Its actually 80 air, 90 fuel for 40 to 70 hp
Model A and B, and I have a 70B
75,95, and 115 hp, are 94 air, and 104 fuel.
Checked fuel and air psi, early on.
Expert:  Noel Schembri replied 2 months ago.

Ok then i am out of ideas so i will opt out maybe someone else can help you.

Expert:  Jason replied 2 months ago.

Good morning, my name is***** am another expert here.

I read everything that has been written so far. What can you tell me about the engine? When did it last start? Did it break down when out on the water, or was it working fine on a Monday and then decided not to start on a Tuesday? How old is the fuel itself?

Customer: replied 2 months ago.
Motor was always hard starting, and became worse, as the hours accumalated.
Had some trans work to be done, and decided to put a new set of piston rings, since the motor was going to be down for some trans work.
Expert:  Jason replied 2 months ago.

Has this engine started since the piston rings were installed?

Customer: replied 2 months ago.
Ive gone threw this motor multiple times, mechanically and electronic portion.
Customer: replied 2 months ago.
No it has not
Customer: replied 2 months ago.
118 psi on all cylinders, give or take a pound
Customer: replied 2 months ago.
The one thing I noticed, is the amount of voltage drop, while starter is being operated, is pretty drastic.
Expert:  Jason replied 2 months ago.

I hate to ask but are you absolutely positive the pistons are installed in the correct position, and not backwards?

Customer: replied 2 months ago.
They cant be installed upside down, due to alignment pin.
Expert:  Jason replied 2 months ago.

Hmmm... The Tohatsu factory service manual would indicate otherwise, and that the pistons can be installed in either direction. Were you working with a factory service manual when you installed the pistons?

Customer: replied 2 months ago.
All three rings are the same, and I never took pistons off rods
Customer: replied 2 months ago.
I guess theres not a tohatsu tech out there, that deals with tldi outboards
Customer: replied 1 month ago.
Unbelievable, how I never heard anytimg back from the new referred expert, never gave a satisfied approval, yet still got charged!!
Sounds like justtake, instead of justanswer!

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