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CATEGORY LISTINGS > FORD DIESEL > Ford 2704ET excess white smoke when cold [ REFRESH ]
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Ford 2704ET excess white smoke when cold


Created On Monday August 06, 2007 16:53 Diesel Talk
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iainmac
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Joined: Jul 2007

Note Monday August 06, 2007 16:53 View thread in raw text format
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We have a motor launch with twin engines. My previous query did not describe the engines correctly. They are Ford 2704ET, Dover series 180 BHP at 2450 rpm, turbo'd and intercooled, 363 cubic inch displacement, also known as 360 T (360 turbo). They take an excessive time to start (except if the "cold start" system is used) and this is not a cold country, coldest temp when I have been starting engines would be round 12 degrees Celcius. Clouds of white/grey smoke are generated till the engines are hot (80 deg C). they also start smoking again when cooling down to about 70 deg C after low rpm running for 15 minutes or so, eg, tying up at marina or anchoring. Both engines have been completely reconditioned professionally, ie, new liners, pistons, guides, valves, camshafts ground, injector pumps overhauled, they are like new. Compression test done cold was 350 psi on all cylinders after 6 compressions (200 psi on first compression). The engineer states that compression should be 375 - 425 psi. I am faced with removing them from the boat, maybe honing bores and new rings, although there is no blow-by. That may not fix the problem. Does anyone have any experience of similar problems being cured? Should I cut my losses and get new engines?
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Snafoow
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Note Monday August 06, 2007 23:02 View thread in raw text format
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350 psi sounds low.

Most compression test on diesel engines are done at a idle with no fuel being fired into the cylinder that is being tested.
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GoneFishen
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Joined: Jan 2007

Note Tuesday August 07, 2007 20:46 View thread in raw text format
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I agree with snafoow, sounds low on compression. Question? I know there is a spec somewhere on crankcase pressure, get the spec's and check it. Also most engines have a way of timing check to be sure that the engine is in time. 1 other thing just came to mind, check the fuel pressure as white smoke/hard starting is an indication of air in the fuel system. The injectors will not atomize the fuel into a spray pattern if the fuel is contaminated with air. Just a few thoughts. If you install new engines and the white smoke is still there and hard to start also, you will not feel good for many mornings........

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DDA tech for 30 years,all 2 cycle,series 60,50 mbe also.
1995 F250, 191k mi.
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iainmac
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Joined: Jul 2007

Note Wednesday August 08, 2007 20:01 View thread in raw text format
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Thanks for your help and interest guys.These engines were reconditioned about 100 hours ago by the previous owner of the boat. The reconditioner is well respected and experienced and has done many of these engines. He believes that the previous owner did not make them work enough during "running in", so the rings have not bedded in, hence the low compression. That sounds likely except that no blow-by is evident. Thanks for tip on air in fuel; we will check that but I have to say these engines run sweetly and give full power when opened up, eg, pushes this heavy wooden displacement vessel up to 15 knots which is 50% over her displacement hull speed! We are also going to check for blow-by at full throttle. One comment I have had is that maybe the "wrong"pistons were installed at the rebuild. This is very unlikely but could explain the low compression. Next step is to take off a cylinder head and actually measure the chamber volumes and calculate the compression ratio. Theoretically should be 15.7:1. That seems low but it's what the book says!
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