In short no. If the US didn't enter the war when it did, UK and France would went bankurtpe in a few months. I don't know what UK had to put of for the loans, but it would became American with short time.
They could still fight on, but at reduced capacity. Loans were still incoming from the colonies and Britain itself still had some financial cards to play, but it would cost them dearly post war, especially if there was no guarantee they would win and get Germany to pay for them.
That said the war would end before 1918, especially as Russia, without the loan issue being dangled over it, would probably end the war sooner than OTL, perhaps before the failed Kerensky offensive of OTL.
The UK would be in a tricky spot post war though. Their recovery would be slow, as the US won't be making more loans to them and Britain took out almost all of the Entente's loans from the US because they could get a better rate from the US than her allies. As a result much would depend on how France and Russia could pay them back. As it was France, even with a white peace, is going to have damages equal to 150% her annual GDP that Germany won't be paying for. The worst part is that all of the damage is in the most productive industrial and agricultural lands of the nation, not to mention most of the coal and iron mines, which were all wrecked.
Plus Britain will have made loans of her own from her own banks to her allies and to the government, so again, much depends on the capacity of the loanees to pay for their debts. Russia and France were the two most devastated nations in the war, so its going to be rough for them, that's for sure. Germany is going to have some serious issues with inflation even if the war ends in 1917, as will the much more unstable and likely soon to fight a civil war Austria-Hungary. In fact Germany here will be occupying Poland and Lithuania and probably will be paying for damages in Belgium and after the war will need to fight in all of her new European holdings plus prop up/annex parts of the Habsburg Empire, which incidentally owes Germany quite a bit of money. Not as much as France or Russia owes Britain, but still substantial amounts. Besides that Germany owes Holland a fair sum too, as she made major loans to Germany during the war to allow her to conduct foreign trade and fight.
So Britain, France, and Russia will all be heavily in debt post war and likely economically depressed with political violence and social instability, while Germany is probably going to lose her only ally, have to fight insurgents, and will have to cope with serious inflation, so won't be sitting pretty either. Long term Germany is in a better place if she can avoid a tariff war, but that isn't guaranteed.
Expect tariffs among all powers as part of lingering resentments, while the US cuts the Europeans out of other markets thanks to having retained her peacetime economy during the war and snapped up all the unserviced markets that the Europeans usually dominated. And with it would be a milder, but still unpleasant, version of the Great Depression in the 1920's, but one that hurts the former Entente much worse than OTL. British-American relations will probably get pretty nasty over the loan issue.