Yanmar 6LP Marine Engine Timing Belt Kit: Which Belt and Parts Do You Need?
You're servicing a Yanmar 6LP marine engine and the timing belt is due for inspection or replacement.
You search:
“Yanmar 6LP marine engine timing belt kit.”
It sounds straightforward.
Buy a timing belt kit, install it and you're finished.
But when you start looking at part numbers, you may find different belts listed for different 6LP engines.
That's because Yanmar 6LP is an engine family, not one single engine configuration.
Depending on the exact model, you may be dealing with engines such as:
- Yanmar 6LP-DTE
- Yanmar 6LP-DTZE
- Yanmar 6LP-STE
- Yanmar 6LP-STZE
- Yanmar 6LPA-DTP
- Yanmar 6LPA-STP
- Yanmar 6LPA-STZP
And the timing components should not automatically be assumed to be identical across all of them.
So before ordering a timing belt or complete set of timing components, start with:
Complete engine model + serial number + existing belt number
For additional components, browse our Yanmar 6LPA Marine Engine Spare Parts page or the complete Yanmar Marine Engine Parts catalogue.
Does Every Yanmar 6LP Use the Same Timing Belt?
No.
This is probably the most important point in this guide.
Different 6LP configurations have documented timing-belt references.
For example:
119770-00461 — Timing Belt 92R2
This timing-belt reference appears in applicable Yanmar 6LP configurations including:
- 6LP-DTE
- 6LP-DTZE
- 6LP-DTZY
- Applicable related 6LP-DT configurations
Another important reference is:
119771-00201 — Timing Belt
This belt is documented for applicable engines including:
- 6LP-STE
- 6LP-STZE
- 6LP-STZY
- Applicable related 6LP-ST configurations
- Selected 6LPA-STP configurations
- Selected 6LPA-STZP configurations
There is also an earlier documented reference:
119771-00200 — Timing belt
So don't buy a belt simply because the listing says:
“Yanmar 6LP timing belt.”
Confirm the exact engine first.
Yanmar 6LP Timing Belt Part Numbers
Some important documented references within the Yanmar 6LP timing system include:
| Part NumberDescriptionApplication Note | ||
| 119770-00461 | Timing belt 92R2 | Applicable 6LP-DT configurations |
| 119771-00200 | Timing belt | Applicable 6LP-ST configurations; earlier reference |
| 119771-00201 | Timing belt | Applicable 6LP-ST and selected 6LPA configurations |
| 119771-00430 | Tensioner | Applicable 6LP timing arrangement |
| 119771-00170 | Idler | Applicable 6LP timing arrangement |
| 119771-00190 | Timing-belt shaft | Applicable 6LP timing arrangement |
| 119771-90180 | Washer | Applicable timing arrangement |
| 119771-90170 | Bolt | Applicable timing arrangement |
These references are useful for identifying the components around the timing belt.
They do not mean every number fits every Yanmar 6LP.
Always verify the exact engine configuration.
What Is Yanmar 119771-00201?
119771-00201 is a timing belt used on applicable Yanmar 6LP and 6LPA engines.
It's an especially useful number to know because it appears across several applicable 6LP-ST and 6LPA configurations.
However, this doesn't make it the universal timing belt for every 6LP.
Applicable 6LP-DT arrangements can use a different belt.
That's why the engine suffix matters.
What Is Yanmar 119771-00200?
119771-00200 is an earlier documented timing-belt reference found in applicable Yanmar 6LP applications.
When sourcing replacement components for an older engine, you may therefore encounter both:
119771-00200
and
119771-00201
If your existing engine documentation shows the earlier number, provide it with your inquiry.
Part-number history is useful when identifying the correct current replacement.
What Is Yanmar 119770-00461?
119770-00461 is a Timing Belt 92R2 documented for applicable Yanmar 6LP-DT series engines.
Applications documented in the parts catalogue include configurations such as the:
6LP-DTE
6LP-DTZE
and related DT-series variants.
This is exactly why we'd avoid telling somebody:
“All 6LP engines use 119771-00201.”
They don't.
What Is Yanmar 119771-00430?
119771-00430 is a timing-belt tensioner used in applicable Yanmar 6LP timing arrangements.
This component deserves attention when carrying out more extensive timing-system maintenance.
A new timing belt depends on the surrounding timing components working correctly.
If the tensioner isn't functioning properly, replacing only the belt may not address the underlying problem.
What Is Yanmar 119771-00170?
119771-00170 is an idler used in applicable Yanmar 6LP timing arrangements.
Like the tensioner, the idler should be inspected when the timing system is opened.
You're already doing the labour required to access the timing belt.
It makes sense to inspect the components the new belt depends on before putting everything back together.
Do I Need a Complete Yanmar 6LP Timing Belt Kit?
Not necessarily.
“Timing belt kit” is a convenient search term, but the Yanmar parts catalogue identifies the timing components individually.
What you actually need depends on the condition of the engine and the maintenance being performed.
For example:
Timing belt only required
You may only need the correct belt.
Tensioner condition questionable
Inspect or replace the applicable tensioner.
Idler has wear or abnormal movement
The idler deserves attention.
Unknown service history
A more comprehensive timing-system inspection may make more sense than replacing only the belt.
The important thing is not to assume that every box advertised online as a “6LP timing belt kit” contains the correct parts for your exact engine.
My Yanmar 6LP Timing Belt Looks Fine. Should I Still Replace It?
Visual appearance isn't the only consideration with a timing belt.
A belt can look acceptable externally while still having aged or deteriorated.
The engine's service history matters.
Ask:
When was the timing belt last replaced?
If the answer is:
“I don't know.”
that's important information.
This is particularly relevant when buying a used boat.
You may receive service records for oil changes and filters but have no reliable record of when the timing belt was last changed.
Don't automatically assume that means the belt is new.
What Happens If the Timing Belt Is Installed Incorrectly?
Correct valve timing is critical.
Yanmar's service information specifically requires checking the timing marks after timing-belt installation.
The crankshaft is rotated and the pulley timing marks are checked against the correct top-dead-centre position.
If the timing marks don't align correctly, the timing belt needs to be reinstalled correctly.
This isn't comparable to changing an alternator belt.
The timing belt controls the relationship between important internal engine components.
Incorrect timing can result in serious engine problems.
Can I Change a Yanmar 6LP Timing Belt Myself?
That depends on your mechanical experience.
Replacing an external drive belt is relatively straightforward.
Replacing an engine timing belt is a different job.
Correct installation requires attention to:
- Timing marks
- Crankshaft position
- Camshaft position
- Belt routing
- Tension
- Tensioner installation
- Idler condition
- Correct fastener torque
- Final valve-timing verification
If you aren't experienced with diesel-engine timing systems, this is a job we'd recommend leaving to an experienced marine diesel technician.
The cost of correcting an incorrectly timed engine can be far higher than the labour saved.
Should I Replace the Tensioner With the Timing Belt?
Inspect it carefully.
If the tensioner has significant service time, questionable operation or unknown history, replacing it while the timing system is already open may be sensible.
For applicable Yanmar 6LP arrangements, an important reference is:
119771-00430 — Tensioner
But verify that number against your exact engine before ordering.
Should I Replace the Idler?
Again, condition matters.
Inspect the applicable idler for:
- Rough rotation
- Excessive play
- Noise
- Damage
- Abnormal wear
A documented reference on applicable 6LP timing arrangements is:
119771-00170 — Idler
Installing a new timing belt while ignoring a damaged idler isn't a good maintenance strategy.
My Yanmar 6LP Timing Belt Is Making Noise
Don't automatically assume the belt itself is the only problem.
Noise from the timing area can justify inspection of:
- Timing belt
- Tensioner
- Idler
- Pulleys
- Bearings
- Belt alignment
- Related rotating components
Identify the source before ordering parts.
A belt kit won't fix a completely unrelated bearing or pulley problem.
I Just Bought a Used Boat With a Yanmar 6LP. Should I Change the Timing Belt?
Check the maintenance records first.
If there is reliable documentation showing when the belt and associated components were serviced, you have something useful to work with.
If there's no record, the situation is different.
A seller saying:
“I think it was changed a few years ago.”
isn't the same as documented maintenance.
For a critical timing component, knowing the maintenance history is valuable.
Can I Identify the Timing Belt From the Old Belt Number?
Yes, an existing readable part number can be extremely helpful.
When requesting replacement timing components, send:
Complete engine model
Engine serial number
Existing timing-belt number
Photographs of the old belt
Tensioner or idler numbers, if readable
Required quantity
This is particularly useful with older 6LP engines where different timing-belt references may appear.
Yanmar 6LP-DTE vs 6LP-STE Timing Belt
This is a useful example of why the complete engine model matters.
An applicable 6LP-DTE arrangement documents:
119770-00461 — Timing Belt 92R2
while applicable 6LP-STE arrangements document the 119771-00200 / 119771-00201 timing-belt family.
So:
6LP-DTE and 6LP-STE should not automatically be assumed to use the same timing belt.
One letter in the engine designation can make a real difference when sourcing parts.
What About the Yanmar 6LPA?
The later Yanmar 6LPA family is closely related, but again, don't assume every component is interchangeable.
Yanmar's catalogue documents 119771-00201 on selected 6LPA configurations, including applicable 6LPA-STP and 6LPA-STZP arrangements.
For additional engine components, visit our Yanmar 6LPA Marine Engine Spare Parts page.
Yanmar 6LP Timing Belt Replacement Checklist
Before ordering or starting the job:
1. Identify the complete engine model
Don't stop at “6LP.”
Record the full designation.
2. Record the engine serial number
This can help identify production differences.
3. Check the existing belt number
If it's still readable, photograph it.
4. Confirm the correct replacement belt
Don't order based solely on engine-family name.
5. Inspect the tensioner
Check the applicable tensioning mechanism carefully.
6. Inspect the idler
Look for wear, play or rough operation.
7. Inspect the pulleys
Check their condition before installing the new belt.
8. Set the engine timing correctly
Follow the applicable service procedure.
9. Install the belt correctly
Correct routing and tension are essential.
10. Verify the timing marks
Don't assume everything is correct just because the belt is fitted.
Yanmar 6LP Timing Belt FAQs
What is the Yanmar 6LP timing belt part number?
There isn't one universal belt number for every 6LP.
Important documented references include:
119770-00461 — Timing Belt 92R2
and
119771-00200 / 119771-00201 — Timing Belt
The correct reference depends on the exact engine configuration.
Does Yanmar 119771-00201 fit every 6LP?
No.
It's documented for multiple applicable 6LP-ST and selected 6LPA configurations, but other 6LP engines use different timing-belt references.
Always verify the complete engine designation.
What timing belt does the Yanmar 6LP-DTE use?
An applicable 6LP-DTE parts arrangement documents:
119770-00461 — Timing Belt 92R2
Check the exact engine and serial number before ordering.
What timing belt does the Yanmar 6LP-STE use?
Applicable 6LP-STE catalogue arrangements document the 119771-00200 / 119771-00201 timing-belt references.
The exact current replacement should be confirmed for the individual engine.
What is the Yanmar 6LP timing-belt tensioner part number?
A documented tensioner reference for applicable 6LP timing arrangements is:
119771-00430 — Tensioner
What is the Yanmar 6LP timing-belt idler part number?
A documented idler reference for applicable 6LP timing arrangements is:
119771-00170 — Idler
Should I replace the tensioner when changing the timing belt?
Inspect its condition and consider the engine's service history.
A worn or faulty tensioner can compromise the operation of a new timing belt.
Is a Yanmar 6LP timing belt the same as an alternator belt?
No.
The timing belt synchronizes critical engine components.
An external alternator or accessory belt performs a different function.
Don't confuse the two when ordering.
Can I order a complete Yanmar 6LP timing belt kit?
Timing components can be sourced according to the exact engine requirement, but don't assume every commercially packaged “6LP timing belt kit” fits every 6LP variant.
Provide the complete engine designation and serial number so the individual components can be checked.
Related Yanmar Marine Engine Parts
For additional Yanmar engine components, browse:
Yanmar 6LPA Marine Engine Spare Parts
Yanmar 6LY Marine Engine Parts
Yanmar 6LF Marine Engine Parts
Yanmar 6LT Marine Engine Parts
For the complete range, visit our Yanmar Marine Engine Parts catalogue.
Need a Yanmar 6LP Timing Belt Kit?
Looking for a Yanmar 6LP timing belt, tensioner, idler or related timing-system component?
Send us:
Complete engine model
Engine serial number
Existing timing-belt part number
Existing tensioner or idler number, if available
Required quantity
Photographs of the existing components
Delivery country or port
If you're looking for references such as 119770-00461, 119771-00200, 119771-00201, 119771-00430 or 119771-00170, include the number in your request so the application can be checked before supply.