Blown hpdi 300

[ClarkBird]

If a cylinder wall is shot on HPDI can you not just put a new sleeve in that one? That's the problem with SHO's is the "coating" they use on cylinders instead of using traditional steel sleeves...means they can't be fixed and must replace the whole block...doesn't make a lot of sense to me....but I'm old school I guess...

A SHO block can be sleeved just like the rest

[yam911]

A SHO block can be sleeved just like the rest

Like the rest of what?

[skeeter21i]

Yes. The bolts are behind the reed blocks/intake.

Thank you

[skeeter21i]

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[skeeter21i]

Got all the aluminum melted out 20200203_162631.jpg20200203_162628.jpgof the cylinder and then honed it out so hopefully it will be ok will know in a few weeks 20200203_162638.jpg20200203_162635.jpg

[yam911]

Looks great.

[skeeter21i]

Thank you I have rebuilt many zero turn motors but this is my first two stroke looks strange having holes in the cylinder wall lol

[CJ1]

like yam911 said looks good. Now do yourself a favor while you are in it this deep, put a set of WSM pistons in it from Hydro Tec if they have not been changed. No way I would trust the ring locating pins to stay in with stock pistons in a engine this old. CJ

[skeeter21i]

Wish I had the money I would but hopefully these motors are good for more than 300 hours I don't think I would have had any problems now if not for a stuck injector

[skeeter21i]

like yam911 said looks good. Now do yourself a favor while you are in it this deep, put a set of WSM pistons in it from Hydro Tec if they have not been changed. No way I would trust the ring locating pins to stay in with stock pistons in a engine this old. CJ

Just curious are wsm pistons from hydro tec different than just plain wsm pistons thanks

[CJ1]

Just curious are wsm pistons from hydro tec different than just plain wsm pistons thanks

I doubt it but gives him a place to buy from and the knowledge to supply the right ones the first time. CJ

[skeeter21i]

Ok thanks

[CJ1]

Ok thanks

I believe they are the WSM Platinum series but again it has been awhile. These engines run right on the edge of detonation and that is what I and a few others believe they rattle the ring locating pins loose on the piston. The top 2 cylinders run the warmest and have the most probability for detonation/pre ignition. So that is why they are normally the failure ones, unless a bad injector or something else takes one out. In your case you are into it this far at least pull the pistons and check the pins. For a little bit of time you may save a costly repair bill in just a few hours. just a suggestion. CJ

[skeeter21i]

I did I pulled all of them out I can still see the hone marks on the rest of the cylinders but I did go ahead and ordered all new wsm pistons from wsm I only see one piston on their site so hopefully they are the platinum ones20200213_102337.jpg

[skeeter21i]

The pistons are all really clean and no carbon buildup rings still look new

[CJ1]

Looks like a bit of dirt embedded into the skirts, by looking at the pistons I would measure them to see the wear on them if any. Just have different looking wear patterns. On number 1 and 2 take a set of needle nose pliers and see if you can wiggle or remove the locating pins for the rings. Measure the piston to wall clearance and check ring end gap [should be no problem with that but I check anyway] then you will KNOW the powerhead is right. CJ

[skeeter21i]

ok motor has all new pistons i have 105 to 110 psi have not broke the motor in yet im back to my original problem of will not idle in water runs perfect on the hose i have replaced
bulb
in boat filter
fuel filter and water sep on the motor
both lp pumps
vst filter
had injectors cleaned
new plugs
new crank battery
im thinking computer but want to see what yall think before i spend 1500 on one

[skeeter21i]

here is today yds

YAMAHA DIAGNOSTIC SYSTEM						[IMG]file:///C:/Users/you/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png[/IMG]
Save date & Time		At 13:45 On February 16 2020
ECM No.		6C98591A21
Model Name
Engine Serial No. (P.I.D.#.)
Customer Name
Dealer Name
1.Diagnosis
Item		Result	Code		Item		Result	Code
Pulser coil		Normal	13
Crank position sensor		Normal	14
Water temp sensor		Normal	15
Throttle position sensor		Normal	18
Battery voltage		Normal	19
Atmospheric press sensor		Normal	22
Intake temp sensor		Normal	23
Fuel press sensor		Normal	25
Injector		Normal	26
Water in fuel		No	27
Shift position switch		Normal	28
Engine stop lanyard switch		Off	44
2.Diagnosis Record
Item		Occurred	Code
Fuel pressure too low		305.2	62
3.Engine Record
Data Item			Result	Occurred
Engine speed maximum			5750	303.8
Fuel pressure minimum			0.12	266.9
Over rev.control record			9
Overheat record			42
4.Engine Monitor
Monitor Item (DATA)		Result	Unit	Monitor Item ON/OFF			Result
Engine speed		825	r/min	Firing of cylinder #1			Yes
Fuel pressure (7.0±1.5)		6.66	MPa	Firing of cylinder #2			Yes
Fuel pressure (1015±217)		965.72	psi	Firing of cylinder #3			Yes
Atmospheric pressure		992	HPa	Firing of cylinder #4			Yes
Atmospheric pressure		29.4	inHg	Firing of cylinder #5			Yes
Ignition timing		BTDC 3	deg	Firing of cylinder #6			Yes
Battery voltage (12-16)		13.77	V	Starter switch			OFF
TPS voltage (0.5-4.5)		0.63	V	Engine stop lanyard switch			OFF
Throttle valve opening (0-90)		2.7	deg	Main switch			ON
Fuel injection duration		1.08	ms	Shift position switch			OFF
Water temperature (below 90)		33	°C	Water detection switch			OFF
Water temperature (below 194)		91.4	°F	Oil level switch (remote tank)			ON
Intake temperature (below 70)		24	°C	Oil level switch1(engine tank)			ON
Intake temperature (below 158)		75.2	°F	Oil level switch2(engine tank)			OFF
Electric oil pump		Low		Oil level switch3(engine tank)			OFF
				Water temp switch (overheat)			OFF
				Dual engine system switch			OFF
				Shift cut-off switch			OFF
5.Data Logger [Engine operating hours according to engine speed]
Engine speed		Time[h]
- 1000 r/min		217.1
1000 - 2000 r/min		16.5
2000 - 3000 r/min		1.3
3000 - 4000 r/min		31.5
4000 - 5000 r/min		26.7
5000 - 6000 r/min		12.2
6000 - 7000 r/min		0
Total hours of operation		305
6.Data Logger [Data comparison graph]
Time	Unit	Engine speed	Fuel pressure	Battery voltage		TPS voltage	Water temperature
		[r/min]	(7.0±1.5)[MPa]	(12-16)[V]		(0.5-4.5)[V]	(below 90)[°C]
20	min	500	6.61	13.48		0.66	47
19	min	1350	6.76	13.99		0.7	41.5
18	min	1450	6.71	14.43		0.84	47.5
17	min	1400	6.71	13.92		0.84	50.5
16	min	450	6.61	13.84		0.7	51.5
15	min	500	6.61	13.77		0.7	49.3
14	min	1200	6.71	14.21		0.7	41
13	min	900	6.66	13.99		0.7	49.3
12	min	1100	6.66	13.99		0.7	46.5
11	min	350	5.49	12.96		0.7	43.5
10	min	1200	6.76	13.99		0.68	38.5
9	min	1050	6.66	14.06		1.11	35.5
8	min	3350	6.71	13.92		4.16	49.3
7	min	3600	6.71	14.14		3.4	52.3
6	min	450	6.61	13.48		0.8	53
5	min	1050	6.76	14.14		0.63	23.5
4	min	900	6.71	13.84		0.63	34.5
3	min	900	6.71	14.65		0.63	43.5
2	min	750	6.71	14.79		0.63	48.5
1	min	1250	6.76	13.55		1.11	35.5
0.9	min	500	6.66	13.26		0.74	36.5
0.8	min	950	6.66	13.11		0.63	28.5
0.7	min	950	6.66	13.26		0.63	28.5
0.6	min	800	6.66	13.4		0.63	28.5
0.5	min	900	6.66	13.48		0.63	29
0.4	min	850	6.71	13.48		0.63	29.5
0.3	min	900	6.66	13.55		0.63	30
0.2	min	950	6.71	13.7		0.63	31
0.1	min	850	6.66	13.7		0.63	32
7.Record of Engine Oil Exchange
Number	Time[h]
1
2
3
4
5
6
7
8
9
10

[CJ1]

Did you check fuel pressure. It is not uncommon to have to tilt a HPDI up to start. Water pressure on the exhaust? Almost sounds like what yours is doing with not running in the water but on the hose. Don't have any idea why as I have not had one with this issue long enough to figure it out. Did you do all the adjustments, throttle linkage, idle, TPS, ect? CJ

[skeeter21i]

I did do all that I talked to a guy last night that had the same problem and it was the pump in the vst so I'm going to put one in Wednesday I will post after that