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Old 24-02-2014, 14:05   #1
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3GM30F Engine Mounts

I have a spare set of engine mounts for the above engine and is now time to replace the old ones (1200 hours). The spare set appear to be genuine Yanmar mounts with 100 moulded into the side of the rubber. However the bolt size is M14 instead of M16 currently on the engine and as specified on the Yanmar specs. Did they ever use different size bolts and is there likely to be a problem with a larger clearance between the bolt and engine bracket.
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Old 20-08-2014, 20:40   #2
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Re: 3GM30F Engine Mounts

PusH~Anyone knows?
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Old 21-08-2014, 06:40   #3
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Re: 3GM30F Engine Mounts

I would be concerned.

The 3GM30(F) uses 4 mounts, all using M16 bolts.
2 x 100 (P & S) on Front end
2 x 75 (P & S) on Rear end (gear box)

The 50's and 70's use M14 bolts.

ENGINE MOUNTS
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Old 15-07-2018, 09:43   #4
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Re: 3GM30F Engine Mounts

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Originally Posted by GordMay View Post
I would be concerned.

The 3GM30(F) uses 4 mounts, all using M16 bolts.
2 x 100 (P & S) on Front end
2 x 75 (P & S) on Rear end (gear box)

The 50's and 70's use M14 bolts.

ENGINE MOUNTS
I need new engine mounts for my 2 3gm30f engines and it seems you understand them.

When I look at my parts manual I see the information shown in the attached pictures. There are 3 part numbers and the notation 'flex.70' 'flex.100' and just 'flexible' . I have no idea which parts to order. Does the 'flex.70' etc relate to the 70 (P & S) in your response? What does 'P & S' mean?

Thanks for any help on which parts to order!
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Old 15-07-2018, 09:49   #5
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Re: 3GM30F Engine Mounts

This is a tangent to the topic, but how do you know when the mounts need replacement? Besides obvious cracks or crumbling, that is.
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Old 15-07-2018, 11:19   #6
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Re: 3GM30F Engine Mounts

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This is a tangent to the topic, but how do you know when the mounts need replacement? Besides obvious cracks or crumbling, that is.
My mechanic said something about putting 1-2 fingers underneath, rather not being able to, so I think it has to do with how flattened they are?
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Old 15-07-2018, 17:19   #7
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Re: 3GM30F Engine Mounts

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Originally Posted by RickyEM View Post
........... What does 'P & S' mean?

Thanks for any help on which parts to order!
Port and Starboard.
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Old 15-07-2018, 17:52   #8
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Re: 3GM30F Engine Mounts

One way of interpreting the parts diagram above is that for a 3gm30f engine, I get 4 of item 3 and 2 each of items 1and 2. Is that correct?
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Old 15-07-2018, 18:11   #9
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Re: 3GM30F Engine Mounts

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One way of interpreting the parts diagram above is that for a 3gm30f engine, I get 4 of item 3 and 2 each of items 1and 2. Is that correct?
Probably not correct. Normally you will need 4 mounts total, usually 2 of the -75 and 2 of the -100 but I don't know your situation exactly; perhaps others might be able to be more specific.
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Old 15-07-2018, 19:30   #10
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Re: 3GM30F Engine Mounts

Quote:
Originally Posted by RickyEM View Post
I need new engine mounts for my 2 3gm30f engines and it seems you understand them.

When I look at my parts manual I see the information shown in the attached pictures. There are 3 part numbers and the notation 'flex.70' 'flex.100' and just 'flexible' . I have no idea which parts to order. Does the 'flex.70' etc relate to the 70 (P & S) in your response? What does 'P & S' mean?

Thanks for any help on which parts to order!
According to this manual you need 2 124772-08341 and 2 128270-08341 for the 'F' engine or 4 124772-08341 mounts for the 'FVE' engine.

https://www.google.com/url?sa=t&rct=...j9Rcb9QaA5Oi7H





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Old 15-07-2018, 20:33   #11
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Re: 3GM30F Engine Mounts

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Originally Posted by Attikos View Post
This is a tangent to the topic, but how do you know when the mounts need replacement? Besides obvious cracks or crumbling, that is.
' Yanmar: Qm Gm hm 4jh 4jh2 Repair Manual Yanmar 1975 1998 Repair Manual, Covers All Qm, Gm/hm, 4jh And 4jh2 Series Engines And Transmissions

Pages 9-6 and 9-7 --- Less than 3/16" gap between the metal portions at the center of the mount or if over 2 years old.

Bill
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Old 15-07-2018, 20:56   #12
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Re: 3GM30F Engine Mounts

For a 3gm30f with standard transmission, 75# mounts go on the transmission and 100# on front of engine. If you have a Vdrive, it's 100# all around.

Note that the mounts can come loose from the steel plates. Though that generally takes many many years (15-20+).

I recommend painting the black steel as what comes from yanmar looks like primer. It does not last long and starts to rust, just looking at it.
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Old 15-07-2018, 21:42   #13
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Re: 3GM30F Engine Mounts

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Originally Posted by wsmurdoch View Post
' Yanmar: Qm Gm hm 4jh 4jh2 Repair Manual Yanmar 1975 1998 Repair Manual, Covers All Qm, Gm/hm, 4jh And 4jh2 Series Engines And Transmissions

Pages 9-6 and 9-7 --- Less than 3/16" gap between the metal portions at the center of the mount or if over 2 years old.

Bill
Bill, can you send me the PDF or a link to the PDF. I can't seem to get any of the PDF links on that page to work
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Old 15-07-2018, 21:57   #14
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Re: 3GM30F Engine Mounts

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Originally Posted by sailorchic34 View Post
For a 3gm30f with standard transmission, 75# mounts go on the transmission and 100# on front of engine. If you have a Vdrive, it's 100# all around.

Note that the mounts can come loose from the steel plates. Though that generally takes many many years (15-20+).

I recommend painting the black steel as what comes from yanmar looks like primer. It does not last long and starts to rust, just looking at it.


I have a standard transmission, thanks
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Old 16-07-2018, 05:34   #15
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Re: 3GM30F Engine Mounts

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Bill, can you send me the PDF or a link to the PDF. I can't seem to get any of the PDF links on that page to work
That should be a link to the pdf. You need to do nothing after opening the window. It is quite large; about 95Mb as the note on the screen says,

"NOTE: DO NOT HIT REFRESH!!! These files are big and can take a long time to load. This file is 94.3 MB. Give it time. If there is text in the file, you can scroll it while the image loads. Enjoy".

I have to leave the window open for about 45 minutes with my internet connection for the thing to download. I can watch the activity as it downloads in the Task Manager, Performance, WiFi window. After the book appears, I click on the pages of the book, choose "save as" and save it on my PC.

Bill
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