Odd noise and compression drop
 

Boat specs: 1967 SeaRay 190SRV with OMC 185 in/out drive. GM small block V8,
283 cid.

Laid-up for winter, working top-notch at end of last season. Winterized
before storage.

Started right up after prepared for new season. When put in the water engine
started to have a miss. If distributor plug wire for cylinder number 7, is
removed from distributor cap, miss seems to go away.

Put all new ignition parts in and acted the same way.

Have tried to run boat in water to get rid of possible carbon, but boat bogs
and backfires even when increasing speed very slowly. At low speeds o.k.,
but when medium speeds are reached, backfiring starts.

Took off valave cover. No broken springs. Checked compression on all
cylinders and all had same psi of 90.

Mechanic suggested new gas.

Other mechanic at lake said low compression and take off both heads and have
hard seats installed.

Weird part is that boat ran fine at layup last fall. Inside all winter mand
profesionally laid up with new fluids and engine fogged out.

Any ideas what could be gong on.

Thanks,


S. Schaus

Odd noise and compression drop
 

Verify that the timing is correct and not varying from a worn chain.

Sounds to me like the carb needs rebuild. Don't touch the heads.

Tony

"Scott Schaus" wrote in message
thlink.net...
Boat specs: 1967 SeaRay 190SRV with OMC 185 in/out drive. GM small block
V8,
283 cid.

Laid-up for winter, working top-notch at end of last season. Winterized
before storage.

Started right up after prepared for new season. When put in the water
engine
started to have a miss. If distributor plug wire for cylinder number 7, is
removed from distributor cap, miss seems to go away.

Put all new ignition parts in and acted the same way.

Have tried to run boat in water to get rid of possible carbon, but boat
bogs
and backfires even when increasing speed very slowly. At low speeds o.k.,
but when medium speeds are reached, backfiring starts.

Took off valave cover. No broken springs. Checked compression on all
cylinders and all had same psi of 90.

Mechanic suggested new gas.

Other mechanic at lake said low compression and take off both heads and
have
hard seats installed.

Weird part is that boat ran fine at layup last fall. Inside all winter
mand
profesionally laid up with new fluids and engine fogged out.

Any ideas what could be gong on.

Thanks,


S. Schaus

Odd noise and compression drop
 

That sure sounds like 5 and 7 are crossed. Is that possible.?

--
Steve (here to have fun) Barker
Stilwell, Kansas
UP (MoPac) Coffeyville Sub MP 308
Coolpix 995 / PSP 7.04
PS 7 in the background waiting to be learnt.

=======================
Remove the not dot from my address to abuse my email box
"Scott Schaus" wrote in message
thlink.net...
Boat specs: 1967 SeaRay 190SRV with OMC 185 in/out drive. GM small block
V8,
283 cid.

Laid-up for winter, working top-notch at end of last season. Winterized
before storage.

Started right up after prepared for new season. When put in the water
engine
started to have a miss. If distributor plug wire for cylinder number 7, is
removed from distributor cap, miss seems to go away.

Put all new ignition parts in and acted the same way.

Have tried to run boat in water to get rid of possible carbon, but boat
bogs
and backfires even when increasing speed very slowly. At low speeds o.k.,
but when medium speeds are reached, backfiring starts.

Took off valave cover. No broken springs. Checked compression on all
cylinders and all had same psi of 90.

Mechanic suggested new gas.

Other mechanic at lake said low compression and take off both heads and
have
hard seats installed.

Weird part is that boat ran fine at layup last fall. Inside all winter
mand
profesionally laid up with new fluids and engine fogged out.

Any ideas what could be gong on.

Thanks,


S. Schaus

Odd noise and compression drop
 

Hi,

I had a 74' Fiberform with a 302 Ford engine that sat for many years
before I bought it. The first few times I used it, it idled fine but
backfired at more than 1/2 throttle. The problem was the springs for
the mechanical advance in the distributor had rusted and were weak,
allowing the timing to over advance. New springs fixed that problem.

Also, since it sat for so long, carbon started flaking off the
pistons/heads. It took several months of running, and cleaning plugs
before the carbon worked its way out. Meantime, I would foul a plug 2
or 3 times a day.

Hope this helps,

Ron

Odd noise and compression drop
 

I would also check the timing advance. The weights in the distributor may be
frozen. I would also check the vacuum hose that runs to the distributor.

Bill
"Scott Schaus" wrote in message
thlink.net...
Boat specs: 1967 SeaRay 190SRV with OMC 185 in/out drive. GM small block
V8,
283 cid.

Laid-up for winter, working top-notch at end of last season. Winterized
before storage.

Started right up after prepared for new season. When put in the water
engine
started to have a miss. If distributor plug wire for cylinder number 7, is
removed from distributor cap, miss seems to go away.

Put all new ignition parts in and acted the same way.

Have tried to run boat in water to get rid of possible carbon, but boat
bogs
and backfires even when increasing speed very slowly. At low speeds o.k.,
but when medium speeds are reached, backfiring starts.

Took off valave cover. No broken springs. Checked compression on all
cylinders and all had same psi of 90.

Mechanic suggested new gas.

Other mechanic at lake said low compression and take off both heads and
have
hard seats installed.

Weird part is that boat ran fine at layup last fall. Inside all winter
mand
profesionally laid up with new fluids and engine fogged out.

Any ideas what could be gong on.

Thanks,


S. Schaus

Odd noise and compression drop
 

You do not see vacuum hoses on most boats. IS for fuel savings when
coasting, which is not what a boat does.
Bill

"Bill" wrote in message
...
I would also check the timing advance. The weights in the distributor may
be
frozen. I would also check the vacuum hose that runs to the distributor.

Bill
"Scott Schaus" wrote in message
thlink.net...
Boat specs: 1967 SeaRay 190SRV with OMC 185 in/out drive. GM small block
V8,
283 cid.

Laid-up for winter, working top-notch at end of last season. Winterized
before storage.

Started right up after prepared for new season. When put in the water
engine
started to have a miss. If distributor plug wire for cylinder number 7,
is
removed from distributor cap, miss seems to go away.

Put all new ignition parts in and acted the same way.

Have tried to run boat in water to get rid of possible carbon, but boat
bogs
and backfires even when increasing speed very slowly. At low speeds
o.k.,
but when medium speeds are reached, backfiring starts.

Took off valave cover. No broken springs. Checked compression on all
cylinders and all had same psi of 90.

Mechanic suggested new gas.

Other mechanic at lake said low compression and take off both heads and
have
hard seats installed.

Weird part is that boat ran fine at layup last fall. Inside all winter
mand
profesionally laid up with new fluids and engine fogged out.

Any ideas what could be gong on.

Thanks,


S. Schaus

Odd noise and compression drop
 

No it is for timing advance
"Calif Bill" wrote in message
...
You do not see vacuum hoses on most boats. IS for fuel savings when
coasting, which is not what a boat does.
Bill

"Bill" wrote in message
...
I would also check the timing advance. The weights in the distributor
may
be
frozen. I would also check the vacuum hose that runs to the distributor.

Bill
"Scott Schaus" wrote in message
thlink.net...
Boat specs: 1967 SeaRay 190SRV with OMC 185 in/out drive. GM small
block
V8,
283 cid.

Laid-up for winter, working top-notch at end of last season.
Winterized
before storage.

Started right up after prepared for new season. When put in the water
engine
started to have a miss. If distributor plug wire for cylinder number
7,
is
removed from distributor cap, miss seems to go away.

Put all new ignition parts in and acted the same way.

Have tried to run boat in water to get rid of possible carbon, but
boat
bogs
and backfires even when increasing speed very slowly. At low speeds
o.k.,
but when medium speeds are reached, backfiring starts.

Took off valave cover. No broken springs. Checked compression on all
cylinders and all had same psi of 90.

Mechanic suggested new gas.

Other mechanic at lake said low compression and take off both heads
and
have
hard seats installed.

Weird part is that boat ran fine at layup last fall. Inside all winter
mand
profesionally laid up with new fluids and engine fogged out.

Any ideas what could be gong on.

Thanks,


S. Schaus

Odd noise and compression drop
 

Yes it is timing advance. You advance the timing a bunch when coasting and
the vacuum is high. No knocking and you get much better mileage. Is why
boats do not have the vacuum line on marine distributors.
Bill

"Bill" wrote in message
...
No it is for timing advance
"Calif Bill" wrote in message
...
You do not see vacuum hoses on most boats. IS for fuel savings when
coasting, which is not what a boat does.
Bill

"Bill" wrote in message
...
I would also check the timing advance. The weights in the distributor
may
be
frozen. I would also check the vacuum hose that runs to the
distributor.

Bill
"Scott Schaus" wrote in message
thlink.net...
Boat specs: 1967 SeaRay 190SRV with OMC 185 in/out drive. GM small
block
V8,
283 cid.

Laid-up for winter, working top-notch at end of last season.
Winterized
before storage.

Started right up after prepared for new season. When put in the
water
engine
started to have a miss. If distributor plug wire for cylinder number
7,
is
removed from distributor cap, miss seems to go away.

Put all new ignition parts in and acted the same way.

Have tried to run boat in water to get rid of possible carbon, but
boat
bogs
and backfires even when increasing speed very slowly. At low speeds
o.k.,
but when medium speeds are reached, backfiring starts.

Took off valave cover. No broken springs. Checked compression on all
cylinders and all had same psi of 90.

Mechanic suggested new gas.

Other mechanic at lake said low compression and take off both heads
and
have
hard seats installed.

Weird part is that boat ran fine at layup last fall. Inside all
winter
mand
profesionally laid up with new fluids and engine fogged out.

Any ideas what could be gong on.

Thanks,


S. Schaus